Realms

The following topics describe realms and identity policies:

About Realms and Realm Sequences

Realms are connections between the Firepower Management Center and the user accounts on the servers you monitor. They specify the connection settings and authentication filter settings for the server. Realms can:

  • Specify the users and user groups whose activity you want to monitor.

  • Query the user repository for user metadata on authoritative users, as well as some non-authoritative users: POP3 and IMAP users detected by traffic-based detection and users detected by traffic-based detection, a TS Agent, or ISE/ISE-PIC.

A realm sequence is an ordered list of two or more Active Directory realms to use in identity policy. When you associate a realm sequence with an identity rule, the system searches the Active Directory domains in order from first to last as specified in the realm sequence.

You can add multiple domain controllers as directories in a realm, but they must share the same basic realm information. The directories in a realm must be exclusively LDAP or exclusively Active Directory (AD) servers. After you enable a realm, your saved changes take effect next time the FMC queries the server.

To perform user awareness, you must configure a realm for any of the supported server types. The system uses these connections to query the servers for data associated with POP3 and IMAP users, and to collect data about LDAP users discovered through traffic-based detection.

The system uses the email addresses in POP3 and IMAP logins to correlate with LDAP users on an Active Directory or OpenLDAP. For example, if a managed device detects a POP3 login for a user with the same email address as an LDAP user, the system associates the LDAP user’s metadata with that user.

To perform user control, you can configure any of the following:

  • A realm or realm sequence for an Active Directory server, or for ISE/ISE-PIC


    Note

    Configuring a Microsoft AD realm or realm sequence is optional if you plan to configure SGT ISE attribute conditions but not user, group, realm, Endpoint Location, or Endpoint Profile conditions; or if you use your identity policy only to filter network traffic.

  • A realm or realm sequence for a Microsoft AD server for the TS Agent.

  • For captive portal, an LDAP realm.

    A realm sequence is not supported for LDAP.

You can nest Microsoft AD groups and the FMC downloads those groups and the users they contain. You can optionally restrict which groups and users get downloaded as discussed in Create an LDAP Realm or an Active Directory Realm and Realm Directory.

About User Synchronization

You can configure a realm or realm sequence to establish a connection between the FMC and an LDAP or Microsoft AD server to retrieve user and user group metadata for certain detected users:

  • LDAP and Microsoft AD users authenticated by captive portal or reported by ISE/ISE-PIC. This metadata can be used for user awareness and user control.

  • POP3 and IMAP user logins detected by traffic-based detection, if those users have the same email address as an LDAP or AD user. This metadata can be used for user awareness.

The FMC obtains the following information and metadata about each user:

  • LDAP user name

  • First and last names

  • Email address

  • Department

  • Telephone number


Important

To reduce latency between the FMC and your Active Directory domain controller, we strongly recommend you configure a realm directory (that is, domain controller) that is as close as possible geographically to the FMC.

For example, if your FMC is in North America, configure a realm directory that is also in North America. Failure to do so can cause problems such as timeout downloading users and groups.

About User Activity Data

User activity data is stored in the user activity database and user identity data is stored in the users database. The maximum number of users you can store and use in access control depends on your FMC model. When choosing which users and groups to include, make sure the total number of users is less than your model limit. If your access control parameters are too broad, the FMC obtains information on as many users as it can and reports the number of users it failed to retrieve in the Tasks tab page of the Message Center.

To optionally limit the subnets on which a managed device watches for user awareness data, you can use the configure identity-subnet-filter command as discussed in the Cisco Secure Firewall Threat Defense Command Reference.


Note

If you remove a user that has been detected by the system from your user repository, the FMC does not remove that user from its users database; you must manually delete it. However, your LDAP changes are reflected in access control rules when the FMC next updates its list of authoritative users.

Realms and Trusted Domains

When you configure a Microsoft Active Directory (AD) realm in the FMC, it is associated with a Microsoft Active Directory or LDAP domain.

A grouping of Microsoft Active Directory (AD) domains that trust each other is commonly referred to as a forest. This trust relationship can enable domains to access each other's resources in different ways. For example, a user account defined in domain A can be marked as a member of a group defined in domain B.

The system and trusted domains

The system supports AD forests that are configured in a trust relationship. There are several types of trust relationships; this guide discusses two-way, transitive forest trust relationships. The following simple example shows two forests: forest.example.com and eastforest.example.com . Users and groups in each forest can be authenticated by AD in the other forest, provided you configure the forests that way.

If you set up the system with one realm for each domain and one directory for each domain controller, the system can discover up to 100,000 foreign security principals (users and groups). If these foreign security principals match a user downloaded in another realm, then they can be used in access control policy.

You need not configure a realm for any domain that has no users you wish to use in access control policies.

The simplest way for the Firepower System to access users in Active Directory forests is to set up each domain as a realm in the Firepower System. The forests must be configured with a two-way transitive forest trust relationship.

To continue the example, suppose you have three AD forests (one of which could be a subdomain or an independent forest), all set up as two-way transitive forest relationships, all users and groups are available in all three forests as well as in the system. (As in the preceding example, all three AD domains must be set up as realms and all domain controllers must be configured as directories in those realms.)

You can extend the preceding example by setting up a third forest also configured with two-way transitive forest trust. Each Active Directory domains must be configured with a realm in the Firepower System.

Finally, you can set up the FMC to be able to enforce identity policies on users and groups in a two-forest system with two-way transitive forest trust. Suppose each forest has at least one domain controller, each of which authenticates different users and groups. For the FMC to be able to enforce identity policies on those users and groups, you must set up each domain containing relevant users as FMC realm and each domain controller as FMC directory in the respective realm.

Failure to properly configure the FMC prevents some of the users and groups from being able to be used in policies. You will see warnings when you try to synchronize users and groups in that case.

A more realistic example is for Active Directory forests to each have subdomains consisting of one ore more domain controllers. In this case, each domain corresponds to a realm and each domain controller corresponds to a directory server.

Using the preceding example, set up the FMC as follows:

  • Realm for any domain in forest.example.com that contains users you want to control with access control policies

    • Directory in the realm for AMERICAS.forest.example.com

    • Directory in the realm for ASIA.forest.example.com

  • Realm for any domain in eastforest.example.com that contains users you want to control with access control policies

    • Directory in the realm for EUROPE.eastforest.example.com


Note

The FMC uses the AD field msDS-PrincipalName to resolve references to find user and group names in each domain controller. msDS-PrincipalName returns a NetBIOS name.

Supported Servers for Realms

You can configure realms to connect to the following types of servers, providing they have TCP/IP access from the FMC:

Server Type

Supported for ISE/ISE-PIC data retrieval?

Supported for TS Agent data retrieval?

Supported for captive portal data retrieval?

Microsoft Active Directory on Windows Server 2012, 2016, and 2019

Yes

Yes

Yes

OpenLDAP on Linux

No

No

Yes

An Active Directory Global Catalog server is not supported as a realm directory. For more information about the Global Catalog Server, see Global Catalog on learn.microsoft.com.


Note

If the TS Agent is installed on a Microsoft Active Directory Windows Server shared with another passive authentication identity source (ISE/ISE-PIC), the FMC prioritizes the TS Agent data. If the TS Agent and a passive identity source report activity by the same IP address, only the TS Agent data is logged to the FMC.

Note the following about your server group configurations:

  • To perform user control on user groups or on users in groups, you must configure user groups on the LDAP or Active Directory server.

  • Group names cannot start with S- because it is used internally by LDAP.

    Neither group names nor organizational unit names can contain special characters like asterisk (*), equals (=), or backslash (\); otherwise, users in those groups or organizational units are not downloaded and are not available for identity policies.

  • To configure an Active Directory realm that includes or excludes users who are members of a sub-group on your server, note that Microsoft recommends that Active Directory has no more than 5000 users per group in Windows Server 2012. For more information, see Active Directory Maximum Limits—Scalability on MSDN.

    If necessary, you can modify your Active Directory server configuration to increase this default limit and accommodate more users.

  • To uniquely identify the users reported by a server in your Remote Desktop Services environment, you must configure the Cisco Terminal Services (TS) Agent. When installed and configured, the TS Agent assigns unique ports to individual users so the system can uniquely identify those users. (Microsoft changed the name Terminal Services to Remote Desktop Services.)

    For more information about the TS Agent, see the Cisco Terminal Services (TS) Agent Guide.

Supported Server Object Class and Attribute Names

The servers in your realms must use the attribute names listed in the following table for the FMC to retrieve user metadata from the servers. If the attribute names are incorrect on your server, the FMC cannot populate its database with the information in that attribute.

Table 1. Map of attribute names to Firepower Management Center fields

Metadata

FMC Attribute

LDAP ObjectClass

Active Directory Attribute

OpenLDAP Attribute

LDAP user name

Username

  • user

  • inetOrgPerson

samaccountname

cn

uid

first name

First Name

givenname

givenname

last name

Last Name

sn

sn

email address

Email

mail

userprincipalname (if mail has no value)

mail

department

Department

department

distinguishedname (if department has no value)

ou

telephone number

Phone

telephonenumber

telephonenumber


Note

The LDAP ObjectClass for groups is group, groupOfNames, (group-of-names for Active Directory) or groupOfUniqueNames.

For more information about ObjectClasses and attributes, see the following references:

  • Microsoft Active Directory:

    • ObjectClasses: All Classes on MSDN

    • Attributes: All Attributes on MSDN

  • OpenLDAP: RFC 4512

License Requirements for Realms

FTD License

Any

Classic License

Control

Requirements and Prerequisites for Realms

Model Support

Any.

Supported Domains

Any

User Roles

  • Admin

  • Access Admin

  • Network Admin

Create an LDAP Realm or an Active Directory Realm and Realm Directory

If you're setting up ISE/ISE-PIC without a realm, be aware there is a user session timeout that affects how users are seen by the FMC. For more information, see Realm Fields.

The following procedure enables you to create a realm (a connection between the FMC and an Active Directory realm) and a directory (a connection between the FMC and an LDAP server or an Active Directory domain controller).

(Recommended.) To connect securely from the FMC to your Active Directory server, first perform the following tasks:

Microsoft has announced that Active Directory servers will start enforcing LDAP binding and LDAP signing in 2020. Microsoft is making these a requirement because when using default settings, an elevation of privilege vulnerability exists in Microsoft Windows that could allow a man-in-the-middle attacker to successfully forward an authentication request to a Windows LDAP server. For more information, see 2020 LDAP channel binding and LDAP signing requirement for Windows on the Microsoft support site.

For more information about realm and directory configuration fields, see Realm Fields and Realm Directory and Synchronize fields.

A step-by-step example of setting up a realm with cross-domain trust is shown in Configure the FMC for Cross-Domain-Trust: The Setup.

An Active Directory Global Catalog server is not supported as a realm directory. For more information about the Global Catalog Server, see Global Catalog on learn.microsoft.com.


Note

You must specify a unique AD Primary Domain for every Microsoft Active Directory (AD) realm. Although the system allows you to specify the same AD Primary Domain for different Microsoft AD realms, the system won't function properly. This happens because system assigns a unique ID to every user and group in each realm; therefore, the system cannot definitively identify any particular user or group. The system prevents you from specifying more than one realm with the same AD Primary Domain because users and groups won't be identified properly. This happens because system assigns a unique ID to every user and group in each realm; therefore, the system cannot definitively identify any particular user or group.

If you're setting up ISE/ISE-PIC without a realm, be aware there is a user session timeout that affects how users are seen by the FMC. For more information, see Realm Fields.

Before you begin

If you're using Kerberos authentication for captive portal, see the following section before you begin: Prerequisites for Kerberos Authentication.


Important

To reduce latency between the FMC and your Active Directory domain controller, we strongly recommend you configure a realm directory (that is, domain controller) that is as close as possible geographically to the FMC.

For example, if your FMC is in North America, configure a realm directory that is also in North America. Failure to do so can cause problems such as timeout downloading users and groups.

Procedure

Step 1

Log in to the Firepower Management Center.

Step 2

Click System (system gear icon) > Integration > Realms.

Step 3

To create a new realm, choose from Add Realm drop-down list.

Step 4

To perform other tasks (such as enable, disable, or delete a realm), see Manage a Realm.

Step 5

Enter realm information as discussed in Realm Fields.

Step 6

In the Directory Server Configuration section, enter directory information as discussed in Realm Directory and Synchronize fields.

Step 7

(Optional.) To configure another domain for this realm, click Add another directory.

Step 8

Click Configure Groups and Users.

Enter the following information:

Information

Description

AD Primary Domain

Domain for the Active Directory server where users should be authenticated. For additional information, see Realm Fields.

Base DN

The directory tree on the server where the FMC should begin searching for user data.

Group DN

The directory tree on the server where the FMC should begin searching for group data.

Load Groups

Click to load groups from the Active Directory server. If no groups are displayed, enter or edit information in the AD Primary Domain, Base DN, and Group DN fields and click Load Groups.

For more information about those fields, see Realm Fields.

Available Groups section

Limit the groups to use in policy by moving them to either the Included Groups and Users or Excluded Groups and Users list.

Moving one group to the Included Groups and Users list, for example, allows that group only to be used in policy but excludes all other groups.

Groups in the Excluded Groups and Users and the users they contain are excluded from excluded from user awareness and control. All other groups and users are available.

For more information, see Realm Directory and Synchronize fields.

Step 9

Click the Realm Configuration tab.

Step 10

Enter Group Attribute, and (if you use Kerberos authentication for captive portal) enter AD Join Username and AD Join Password. For more information, see Realm Directory and Synchronize fields.

Step 11

If you use Kerberos authentication, click Test. If the test fails, wait a short time and try again.

Step 12

Enter user session timeout values, in minutes, for ISE/ISE-PIC Users, Terminal Server Agent Users, Captive Portal Users, Failed Captive Portal Users, and Guest Captive Portal Users.

Step 13

When you're finished configuring the realm, click Save.

What to do next

Prerequisites for Kerberos Authentication

If you're using Kerberos to authentication captive portal users, keep the following in mind.

Hostname character limit

If you're using Kerberos authentication, the managed device's host name must be less than 15 characters (it's a NetBIOS limitation set by Windows); otherwise, captive portal authentication fails. You set the managed device host name when you set up the device. For more information, see an article like this one on the Microsoft documentation site: Naming conventions in Active Directory for computers, domains, sites, and OUs.

DNS response character limit

DNS must return a response of 64KB or less to the hostname; otherwise, the AD connection test fails. This limit applies in both directions and is discussed in RFC 6891 section-6.2.5.

Realm Fields

The following fields are used to configure a realm.

Realm Configuration Fields

These settings apply to all Active Directory servers or domain controllers (also referred to as directories) in a realm.

Name

A unique name for the realm.

  • To use the realm in identity policies, the system supports alphanumeric and special characters.

  • To use the realm in RA VPN configurations, the system supports alphanumeric, hyphen (-), underscore (_), and plus (+) characters.

Description
(Optional.) Enter a description of the realm.
Type

The type of realm, AD for Microsoft Active Directory, LDAP for other supported LDAP repositories, or Local. For a list of supported LDAP repositories, see Supported Servers for Realms. You can authenticate captive portal users with an LDAP repository; all others require Active Directory.


Note

Only captive portal supports an LDAP realm.

The realm type LOCAL is used for configuring local user settings. The LOCAL realm is used in remote access user authentication.

Add the following Local User Information for the LOCAL realm:

  • Username—Name of the local user.

  • Password—Local user password.

  • Confirm Password—Confirm the local user password.


Note

Click Add another local user to add more users to the LOCAL realm.

You can add more users after creating the realm and update password for the local users. You can also create multiple LOCAL realms but cannot disable them.

AD Primary Domain

For Microsoft Active Directory realms only. Domain for the Active Directory server where users should be authenticated.


Note

You must specify a unique AD Primary Domain for every Microsoft Active Directory (AD) realm. Although the system allows you to specify the same AD Primary Domain for different Microsoft AD realms, the system won't function properly. This happens because system assigns a unique ID to every user and group in each realm; therefore, the system cannot definitively identify any particular user or group. The system prevents you from specifying more than one realm with the same AD Primary Domain because users and groups won't be identified properly. This happens because system assigns a unique ID to every user and group in each realm; therefore, the system cannot definitively identify any particular user or group.
AD Join Username and AD Join Password
(Available on the Realm Configuration tab page when you edit a realm.)

For Microsoft Active Directory realms intended for Kerberos captive portal active authentication, the distinguished username and password of any Active Directory user with appropriate rights to create a Domain Computer account in the Active Directory domain.

Keep the following in mind:

  • DNS must be able to resolve the domain name to an Active Directory domain controller's IP address.

  • The user you specify must be able to join computers to the Active Directory domain.

  • The user name must be fully qualified (for example, administrator@mydomain.com, not administrator).

If you choose Kerberos (or HTTP Negotiate, if you want Kerberos as an option) as the Authentication Protocol in an identity rule, the Realm you select must be configured with an AD Join Username and AD Join Password to perform Kerberos captive portal active authentication.


Note

The SHA-1 hash algorithm is not secure for storing passwords on your Active Directory server and should not be used. For more information, consult a reference such as Migrating your Certification Authority Hashing Algorithm from SHA1 to SHA2 on Microsoft TechNet or Password Storage Cheat Sheet on the Open Web Application Security Project website.

We recommend SHA-256 for communicating with Active Directory.
Directory Username and Directory Password

The distinguished username and password for a user with appropriate access to the user information you want to retrieve.

Note the following:

  • For some versions of Microsoft Active Directory, specific permissions might be required to read users and groups. Consult the documentation provided with Microsoft Active Directory for details.

  • For OpenLDAP, the user's access privileges are determined by the <level> parameter discussed in section 8 of the OpenLDAP specification. The user's <level> should be auth or better.

  • The user name must be fully qualified (for example, administrator@mydomain.com, not administrator).


Note

The SHA-1 hash algorithm is not secure for storing passwords on your Active Directory server and should not be used. For more information, consult a reference such as Migrating your Certification Authority Hashing Algorithm from SHA1 to SHA2 on Microsoft TechNet or Password Storage Cheat Sheet on the Open Web Application Security Project website.

We recommend SHA-256 for communicating with Active Directory.
Base DN

(Optional.) The directory tree on the server where the Firepower Management Center should begin searching for user data. If you don't specify a Base DN, the system retrieves the top-level DN provided you can connect to the server.

Typically, the base distinguished name (DN) has a basic structure indicating the company domain name and operational unit. For example, the Security organization of the Example company might have a base DN of ou=security,dc=example,dc=com.

Group DN

(Optional.) The directory tree on the server where the Firepower Management Center should search for users with the group attribute. A list of supported group attributes is shown in Supported Server Object Class and Attribute Names. If you don't specify a Group DN, the system retrieves the top-level DN provided you can connect to the server.


Note

Following is the list of characters the system supports in users, groups, DNs in your directory server. Using any characters other than the following could result in the system failing to download users and groups.

Entity Supported characters
User name

a-z A-Z 0-9 ! # $ % ^ & ( ) _ - { } ' . ~ `

Group name

a-z A-Z 0-9 ! # $ % ^ & ( ) _ - { } ' . ~ `

Base DN and Group DN

a-z A-Z 0-9 ! @ $ % ^ & * ( ) _ - . ~ `

A space is not supported anywhere in a user name, including at the end.

The following fields are available when you edit an existing realm.

User Session Timeout
(Available on the Realm Configuration tab page when you edit a realm.)

Enter the number of minutes before user sessions time out. The default is 1440 (24 hours) after the user's login event. After the timeout is exceeded, the user's session ends; if the user continues to access the network without logging in again, the user is seen by the FMC as Unknown (except for Failed Captive Portal Users).

In addition, if you set up ISE/ISE-PIC without a realm and the timeout is exceeded, a workaround is required. For more information, contact Cisco TAC.

You can set timeout values for the following:

  • User Agent and ISE/ISE-PIC Users: Timeout for users tracked by the user agent or by ISE/ISE-PIC, which are types of passive authentication.

    The timeout value you specify does not apply to pxGrid SXP session topic subscriptions (for example, destination SGT mappings). Instead, session topic mappings are preserved as long as there is no delete or update message for a given mapping from ISE.

    For more information about ISE/ISE-PIC, see The ISE/ISE-PIC Identity Source.

  • Terminal Services Agent Users: Timeout for users tracked by the TS Agent, which is a type of passive authentication. For more information, see The Terminal Services (TS) Agent Identity Source.

  • Captive Portal Users: Timeout for users who successfully log in using the captive portal, which is a type of active authentication. For more information, see The Captive Portal Identity Source.

  • Failed Captive Portal Users: Timeout for users who do not successfully log in using the captive portal. You can configure the Maximum login attempts before the user is seen by the FMC as Failed Auth User. A Failed Auth User can optionally be granted access to the network using access control policy and, if so, this timeout value applies to those users.

    For more information about failed captive portal logins, see Captive Portal Fields.

  • Guest Captive Portal Users: Timeout for users who log in to the captive portal as a guest user. For more information, see The Captive Portal Identity Source.

Realm Directory and Synchronize fields

Realm Directory Fields

These settings apply to individual servers (such as Active Directory domain controllers) in a realm.

Hostname / IP Address
Fully qualified host name of the Active Directory domain controller machine. To find the fully qualified name, see Find the Active Directory Server's Name.

If you're using Kerberos for authenticating captive portal, also make sure you understand the following:

If you're using Kerberos authentication, the managed device's host name must be less than 15 characters (it's a NetBIOS limitation set by Windows); otherwise, captive portal authentication fails. You set the managed device host name when you set up the device. For more information, see an article like this one on the Microsoft documentation site: Naming conventions in Active Directory for computers, domains, sites, and OUs.

DNS must return a response of 64KB or less to the hostname; otherwise, the AD connection test fails. This limit applies in both directions and is discussed in RFC 6891 section-6.2.5.

Port

The server's port.

Encryption

(Strongly recommended.) The encryption method to use:

  • STARTTLS—encrypted LDAP connection

  • LDAPS—encrypted LDAP connection

  • None—unencrypted LDAP connection (unsecured traffic)

To communicate securely with an Active Directory server, see Connect Securely to Active Directory.

CA Certificate

The TLS/SSL certificate to use for authentication to the server. You must configure STARTTLS or LDAPS as the Encryption type to use a TLS/SSL certificate.

If you are using a certificate to authenticate, the name of the server in the certificate must match the server Hostname / IP Address. For example, if you use 10.10.10.250 as the IP address but computer1.example.com in the certificate, the connection fails.

Interface used to connect to Directory server
Required only for RA VPN authentication so the Firepower Threat Defense can connect securely to your Active Directory server. This interface is not used for downloading users and groups, however.

You can choose only a routed interface group. For more information, see Interface.

Click one of the following:

  • Resolve via route lookup: Use routing to connect to the Active Directory server.

  • Choose an interface: Choose a specific managed device interface group to connect to the Active Directory server.

User Synchronize Fields

AD Primary Domain

For Microsoft Active Directory realms only. Domain for the Active Directory server where users should be authenticated.


Note

You must specify a unique AD Primary Domain for every Microsoft Active Directory (AD) realm. Although the system allows you to specify the same AD Primary Domain for different Microsoft AD realms, the system won't function properly. This happens because system assigns a unique ID to every user and group in each realm; therefore, the system cannot definitively identify any particular user or group. The system prevents you from specifying more than one realm with the same AD Primary Domain because users and groups won't be identified properly. This happens because system assigns a unique ID to every user and group in each realm; therefore, the system cannot definitively identify any particular user or group.
Enter query to look for users and groups

Base DN:

(Optional.) The directory tree on the server where the FMC should begin searching for user data.

Typically, the base distinguished name (DN) has a basic structure indicating the company domain name and operational unit. For example, the Security organization of the Example company might have a base DN of ou=security,dc=example,dc=com.

Group DN:

(Optional.) The directory tree on the server where the FMC should search for users with the group attribute. A list of supported group attributes is shown in Supported Server Object Class and Attribute Names.


Note

Neither the group name nor the organizational unit name can contain special characters like asterisk (*), equals (=), backslash (\) because users in those groups are not downloaded and cannot be used in identity policies.

Load Groups

Enables you to download users and groups for user awareness and user control.

Available Groups, Add to Include, Add to Exclude

Limits the groups that can be used in policy.

  • Groups that are displayed in the Available Groups field are available for policy unless you move groups to the Included Groups and Users or Excluded Groups and Users field.

  • If you move groups to the Included Groups and Users field, only those groups and users they contain are downloaded and user data is available for user awareness and user control.

  • If you move groups to the Excluded Groups and Users field, all groups and users they contain except these are downloaded and available for user awareness and user control.

  • To include users from groups that are not included, enter the user name in the field below User Inclusion and click Add.

  • To exclude users from groups that are not excluded, enter the user name in the field below User Exclusion and click Add.


    Note

    The users that are downloaded to the FMC is calculated using the formula R = I - (E+e) + i , where

    • R is list of downloaded users

    • I is included groups

    • E is excluded groups

    • e is excluded users

    • i is included users
Synchronize Now
Click to synchronize groups and users with AD.
Begin automatic synchronization at
Enter the time and time interval at which to download users and groups from AD.

Connect Securely to Active Directory

To create a secure connection between an Active Directory server and the FMC (which we strongly recommend), you must perform all of the following tasks:

  • Export the Active Directory server's root certificate.

  • Import the root certificate into the FMC as a trusted CA certificate.

  • Find the Active Directory server's fully qualified name.

  • Create the realm directory.

See one of the following tasks for more information.

Find the Active Directory Server's Name

To configure a realm directory in the FMC, you must know the fully qualified server name, which you can find as discussed in the procedure that follows.

Before you begin

You must log in to the Active Directory server as a user with sufficient privileges to view the computer's name.

Procedure

Step 1

Log in to the Active Directory server.

Step 2

Click Start.

Step 3

Right-click This PC.

Step 4

Click Properties.

Step 5

Click Advanced System Settings.

Step 6

Click the Computer Name tab.

Step 7

Note the value of Full computer name.

You must enter this exact name when you configure the realm directory in the FMC.
What to do next
Create an LDAP Realm or an Active Directory Realm and Realm Directory.

Export the Active Directory Server's Root Certificate

The task that follows discusses how to export the Active Directory server's root certificate, which is required to connect securely to the FMC to obtain user identity information.

Before you begin

You must know the name of your Active Directory server's root certificate. The root certificate might have the same name as the domain or the certificate might have a different name. The procedure that follows shows one way you can find the name; there could be other ways, however.

Procedure

Step 1

Following is one way to find the name of the Active Directory Server's root certificate; consult Microsoft documentation for more information:

  1. Log in to the Active Directory server as a user with privileges to run the Microsoft Management Console.

  2. Click Start and enter mmc .

  3. Click File > Add/Remove Snap-in

  4. From the Available Snap-ins list in the left pane, click Certificates (local).

  5. Click Add.

  6. At the Certificates snap-in dialog box, click Computer Account and click Next.

  7. At the Select Computer dialog box, click Local Computer and click Finish.

  8. Windows Server 2012 only. Repeat the preceding steps to add the Certification Authority snap-in.

  9. Click Console Root > Trusted Certification Authorities > Certificates.

    The server's trusted certificates are displayed in the right pane. The following figure is only an example for Windows Server 2012; yours will probably look different.

    Finding the Active Directory's root certificate under Trusted Root Certificate Authorities.

Step 2

Export the certificate using the certutil command.

This is only one way to export the certificate. It's a convenient way to export the certificate, especially if you can run a web browser and connect to the FMC from the Active Directory server.

  1. Click Start and enter cmd .

  2. Enter the command certutil -ca.cert certificate-name .

    The server's certificate is displayed on the screen.

  3. Copy the entire certificate to the clipboard, starting with -----BEGIN CERTIFICATE----- and ending with -----END CERTIFICATE----- (including those strings).

What to do next
Import the Active Directory server's certificate into the FMC as a Trusted CA Certificate as discussed in Adding a Trusted CA Object.

Synchronize Users and Groups

Synchronizing users and groups means the FMC queries the realms and directories you configured for groups and users in those groups. All users the FMC finds can be used in identity policies.

If issues are found, you most likely need to add a realm that contains users and groups the FMC cannot load. For details, see Realms and Trusted Domains.

Before you begin

Create a FMC realm for each Active Directory domain and a FMC directory for each Active Director domain controller in each forest. See Create an LDAP Realm or an Active Directory Realm and Realm Directory.

You must create a realm only for domains that have users you want to use in user control.

You can nest Microsoft AD groups and the FMC downloads those groups and the users they contain. You can optionally restrict which groups and users get downloaded as discussed in Create an LDAP Realm or an Active Directory Realm and Realm Directory.

Procedure

Step 1

If you haven't done so already, log in to the FMC.

Step 2

Click System (system gear icon) > Integration > Realms.

Step 3

Next to each realm, click Download (download icon).

Step 4

To see the results, click the Sync Results tab.

The Realms column indicates whether or not there were issues synchronizing users and groups in Active Directory forests. Look for the following indicators next to each realm.

Indicator in Realms column

Meaning

(nothing)

All users and groups synchronized without error. No action is necessary.

Yellow Triangle (yellow triangle icon)

There were issues synchronizing users and groups. Make sure you added a realm for each Active Directory domain and a directory for each Active Directory domain controller.

For more details, see Troubleshoot Cross-Domain Trust.

Create a Realm Sequence

The following procedure enables you to create a realm sequence, which is an ordered list of realms the system searches when it applies identity policy. You add a realm sequence to an identity rule exactly the same way as you add a realm; the difference is that the system searches all the realms in the order specified in the realm sequence when applying an identity policy.

Before you begin

You must create and enable at least two realms, each corresponding to a connection with an Active Directory server. You cannot create realm sequences for LDAP realms.

Create a realm as discussed in Create an LDAP Realm or an Active Directory Realm and Realm Directory.

Procedure

Step 1

Log in to the FMC if you have not already done so.

Step 2

Click System (system gear icon) > Integration > Realms > Realm Sequences.

Step 3

Click Add Sequence.

Step 4

In the Name field, enter a name to identify the realm sequence.

Step 5

(Optional.) In the Description field, enter a description for the realm sequence.

Step 6

Under Realms, click Add (add icon).

Step 7

Click the name of each realm to add to the sequence.

To narrow your search, enter all or part of a realm name in Filter field.

Step 8

Click OK.

Step 9

In the Add Realm Sequence dialog box, drag and drop the realms in the order in which you want the system to search for them.

The following figure shows an example of a realm sequence consisting of two realms. The domain-europe.example.com realm will be searched for users before the domain.example.com realm.

How to create a realm sequence consisting of two realms. If used in an identity policy, this configuration causes the system to look in the first realm listed in the dialog box; if users are not found, the system looks in the other realms in the order listed.

Step 10

Click Save.

What to do next

See Create an Identity Policy.

Configure the FMC for Cross-Domain-Trust: The Setup

This is an introduction to several topics that walk you through configuring the FMC with two realms with cross-domain trust.

This step-by-step example involves two forests: forest.example.com and eastforest.example.com . The forests are configured so that certain users and groups in each forest can be authenticated by Microsoft AD in the other forest.

Following is the example setup used in this example.

The simplest way to access users in Active Directory forests is to set up each domain in a forest as a realm. The forests must be configured with a two-way transitive forest trust relationship. Only realms that contain users you wish to include in access control policies need be configured as realms.

Using the preceding example, you would set up the FMC as follows:

  • Realm and directory for any domain in forest.example.com that contains users you want to control with access control policy

  • Realm and directory for any domain in eastforest.example.com that contains users you want to control with access control policy

Each realm in the example has one domain controller, which is configured in the FMC as a directory. The directories in this example are configured as follows:

  • forest.example.com

    • Base distinguished name (DN) for users: ou=UsersWest,dc=forest,dc=example,dc=com

    • Base DN for groups: ou=EngineringWest,dc=forest,dc=example,dc=com

  • eastforest.example.com

    • Base DN for users: ou=EastUsers,dc=eastforest,dc=example,dc=com

    • Base DN for groups: ou=EastEngineering,dc=eastforest,dc=example,dc=com

Configure the Firepower Management Center for Cross-Domain-Trust Step 1: Configure Realms and Directories

This is the first task in a step-by-step procedure that explains how to configure the FMC to recognize Active Directory servers configured in a cross-domain trust relationship, which is an increasingly common configuration for enterprise organizations. For an overview of this sample configuration, see Configure the FMC for Cross-Domain-Trust: The Setup.

If you set up the system with one realm for each domain and one directory for each domain controller, the system can discover up to 100,000 foreign security principals (users and groups). If these foreign security principals match a user downloaded in another realm, then they can be used in access control policy.

Before you begin

You must configure Microsoft Active Directory servers in a cross-domain trust relationship; see Realms and Trusted Domains for more information.

If you authenticate users with LDAP, you cannot use this procedure.

Procedure

Step 1

Log in to the FMC.

Step 2

Click System (system gear icon) > Integration > Realms.

Step 3

Choose from Add Realm drop-down list. .

Step 4

Enter the following information to configure forest.example.com .

To set up a realm, configure the required fields and click Test. Make sure the test is successful before you configure the directory.

Note

 

The Directory Username can be any user in the Active Directory domain; no special permissions are required.

The Interface used to connect to Directory server can be any interface that can connect to the Active Directory server.

Step 5

Click Test and make sure the test succeeds before you continue.

Step 6

Click Configure Groups and Users.

Step 7

If your configuration was successful, the next page is displayed similar to the following.

If you configured the realm and directory correctly, you'll see a list of users and groups.

Note

 

If groups and users were not downloaded, verify the values in the Base DN and Groups DN fields and click Load Groups.

There are other optional configurations available on this page; for more information about them, see Realm Fields and Realm Directory and Synchronize fields.

Step 8

If you made changes on this page or tab pages, click Save.

Step 9

Click System (system gear icon) > Integration > Realms.

Step 10

Click Add Realm.

Step 11

Enter the following information to configure eastforest.example.com .

To set up a realm, configure the required fields and click Test. Make sure the test is successful before you configure groups and users.

Step 12

Click Test and make sure the test succeeds before you continue.

Step 13

Click Configure Groups and Users.

Step 14

If your configuration was successful, the next page is displayed similar to the following.

If you configured the realm and directory correctly, you'll see a list of users and groups.

Configure the FMC for Cross-Domain-Trust Step 2: Synchronize Users and Groups

After you configure two or more Active Directory servers that have a cross-domain trust relationship, you must download users and groups. That process exposes possible issues with the Active Directory configuration (for example, groups or users downloaded for one Active Directory domain but not the other).

Before you begin

Make sure you have performed the tasks discussed in Configure the Firepower Management Center for Cross-Domain-Trust Step 1: Configure Realms and Directories.

Procedure

Step 1

Log in to the FMC.

Step 2

Click System (system gear icon) > Integration > Realms.

Step 3

At the end of the row of any realm in the cross-domain trust, click (Download Now), then click Yes.

Step 4

Click Check Mark (check mark icon) (Notifications) > Tasks.

If groups and users fail to download, try again. If subsequent attempts fail, review your realm and directory setup as discussed in Realm Fields and Realm Directory and Synchronize fields.

Step 5

Click System (system gear icon) > Integration > Realms > Sync Results.

Configure the FMC for Cross-Domain-Trust Step 3: Resolve Issues

The final step in setting up cross-domain trust in the FMC is to make sure users and groups are downloaded without errors. A typical reason why users and groups do not download properly is that the realms to which they belong have not been downloaded to the FMC.

This topic discusses how to diagnose that a group referred in one forest to cannot be downloaded because the realm is not configured to find the group in the domain controller hierarchy.

Before you begin

Procedure

Step 1

Log in to the FMC if you have not already done so.

Step 2

Click System (system gear icon) > Integration > Realms > Sync Results.

In the Realms column, if Yellow Triangle (yellow triangle icon) is displayed next to the name of a realm, you have issues that must be resolved. If not, your results are configured properly and you can quit.

Step 3

Download users and groups again from the realms that display issues.

  1. Click the Realms tab.

  2. Click (Download Now), then click Yes.

Step 4

Click the Sync Results tab page.

If the Yellow Triangle (yellow triangle icon) is displayed in the Realms column, click Yellow Triangle (yellow triangle icon) next to the realm that has issues.

Step 5

In the middle column, click either Groups or Users to find more information.

Step 6

In the Groups or Users tab page, click Yellow Triangle (yellow triangle icon) to display more information.

The right column should display enough information you can isolate the source of the issue.

You can troubleshoot user download errors when users are stored in different Active Directory repositories. Read the columns left to right. Click the triangular icon to get more information.

In the preceding example, forest.example.com includes a cross-domain group CrossForestInvalidGroup that contains another group EastMarketingUsers that was not downloaded by the FMC. If, after synchronizing the eastforest.example.com realm again, the error does not resolve, it likely means that the Active Directory domain controller does not include EastMarketingUsers .

To resolve this issue, you can:

  • Remove the EastMarketingUsers from CrossForestInvalidGroup , synchronize the forest.example.com realm again, and recheck.

  • Remove the ou=EastEngineering value from the Group DN of the eastforest.example.com realm, which causes the FMC to retrieve groups from the highest level in the Active Directory hierarchy, synchronize eastforest.example.com , and recheck.

Manage a Realm

This section discusses how to perform various maintenance tasks for a realm using controls on the Realms page:

If the controls are dimmed, the configuration belongs to an ancestor domain, or you do not have permission to modify the configuration.. If View (View button) appears instead, the configuration belongs to an ancestor domain, or you do not have permission to modify the configuration.

Procedure

Step 1

Log in to the FMC if you haven't already done so.

Step 2

Click System (system gear icon) > Integration > Realms.

Step 3

To delete a realm, click Delete (delete icon).

Step 4

To edit a realm, click Edit (edit icon) next to the realm and make changes as described in Create an LDAP Realm or an Active Directory Realm and Realm Directory.

Step 5

To enable a realm, slide State to the right; to disable a realm, slide it to the left.

Step 6

To download users and user groups, click Download (download icon).

Step 7

To copy a realm, click Copy (copy icon).

Step 8

To compare realms, see Compare Realms.

Compare Realms

You must be an Admin, Access Admin, Network Admin, or Security Approver to perform this task.

Procedure

Step 1

Log in to the FMC.

Step 2

Click System (system gear icon) > Integration > Realms.

Step 3

Click Compare Realms.

Step 4

Choose Compare Realm from the Compare Against list.

Step 5

Choose the realms you want to compare from the Realm A and Realm B lists.

Step 6

Click OK.

Step 7

To navigate individually through changes, click Previous or Next above the title bar.

Step 8

(Optional.) Click Comparison Report to generate the realm comparison report.

Step 9

(Optional.) Click New Comparison to generate a new realm comparison view.

Troubleshoot Realms and User Downloads

If you notice unexpected server connection behavior, consider tuning your realm configuration, device settings, or server settings. For other related troubleshooting information, see:

Symptom: Realms and groups reported but not downloaded

The FMC's health monitor informs you of user or realm mismatches, which are defined as:

  • User mismatch: A user is reported to the FMC without being downloaded.

    A typical reason for a user mismatch is that the user belongs to a group you have excluded from being downloaded to the FMC. Review the information discussed in Firepower Management Center Device Configuration Guide.

  • Realm mismatch: A user logs into a domain that corresponds to a realm not known to the FMC.

For example, if you defined a realm that corresponds to a domain named domain.example.com in the FMC but a login is reported from a domain named another-domain.example.com , this is a realm mismatch. Users in this domain are identified by the FMC as Unknown.

You set the mismatch threshold as a percentage, above which a health warning is triggered. Examples:

  • If you use the default mismatch threshold of 50%, and there are two mismatched realms in eight incoming sessions, the mismatch percentage is 25% and no warning is triggered.

  • If you set the mismatch threshold to 30% and there are three mismatched realms in five incoming sessions, the mismatch percentage is 60% and a warning is triggered.

Unknown users that do not match identity rules have no policies applied to them. (Although you can set up identity rules for Unknown users, we recommend keeping the number of rules to a minimum by identifying users and realms correctly.)

For more information, see Detect Realm or User Mismatches.

Symptom: Users are not downloaded

Possible causes follow:

  • If you have the realm Type configured incorrectly, users and groups cannot be downloaded because of a mismatch between the attribute the system expects and what the repository provides. For example, if you configure Type as LDAP for a Microsoft Active Directory realm, the system expects the uid attribute, which is set to none on Active Directory. (Active Directory repositories use sAMAccountName for the user ID.)

    Solution: Set the realm Type field appropriately: AD for Microsoft Active Directory or LDAP for another supported LDAP repository.

  • Users in Active Directory groups that have special characters in the group or organizational unit name might not be available for identity policy rules. For example, if a group or organizational unit name contains the characters asterisk (*), equals (=), or backslash (\), users in those groups are not downloaded and can't be used for identity policies.

    Solution: Remove special characters from the group or organizational unit name.


Important

To reduce latency between the FMC and your Active Directory domain controller, we strongly recommend you configure a realm directory (that is, domain controller) that is as close as possible geographically to the FMC.

For example, if your FMC is in North America, configure a realm directory that is also in North America. Failure to do so can cause problems such as timeout downloading users and groups.

Symptom: Not all users in a realm are downloaded

Possible causes follow:

  • If you attempt to download more than the maximum number of users in any one realm, the download stops at the maximum number of users and a health alert is displayed. User download limits are set per Firepower Management Center model. For more information, see User Limits for Microsoft Active Directory.

  • Every user must be a member of a group. Users that are members of no groups do not get downloaded.

Symptom: Access control policy doesn't match group membership

This solution applies to an AD domain that is in a trust relationship with other AD domains. In the following discussion, external domain means a domain other than the one to which the user logs in.

If a user belongs to a group defined in a trusted external domain, the FMC doesn't track membership in the external domain. For example, consider the following scenario:

  • Domain controllers 1 and 2 trust each other

  • Group A is defined on domain controller 2

  • User mparvinder in controller 1 is a member of Group A

Even though user mparvinder is in Group A, the FMC access control policy rules specifying membership Group A don't match.

Solution: Create a similar group in domain controller 1 that contains has all domain 1 accounts that belong to group A. Change the access control policy rule to match any member of Group A or Group B.

Symptom: Access control policy doesn't match child domain membership

If a user belongs to a domain that is child of parent domain, Firepower doesn't track the parent/child relationships between domains. For example, consider the following scenario:

  • Domain child.parent.com is child of domain parent.com

  • User mparvinder is defined in child.parent.com

Even though user mparvinder is in a child domain, the Firepower access control policy matching the parent.com don't match mparvinder in the child.parent.com domain.

Solution: Change the access control policy rule to match membership in either parent.com or child.parent.com.

Symptom: Realm or realm directory test fails

The Test button on the directory page sends an LDAP query to the hostname or IP address you entered. If it fails, check the following:

  • The Hostname you entered resolves to the IP address of an LDAP server or Active Directory domain controller.

  • The IP Address you entered is valid.

The Test AD Join button on the realm configuration page verifies the following:

  • DNS resolves the AD Primary Domain to an LDAP server or Active Directory domain controller’s IP address.

  • The AD Join Username and AD Join Password are correct.

    AD Join Username must be fully qualified (for example, administrator@mydomain.com, not administrator).

  • The user has sufficient privileges to create a computer in the domain and join the FMC to the domain as a Domain Computer.

Symptom: User timeouts are occurring at unexpected times

If you notice the system performing user timeouts at unexpected intervals, confirm that the time on your ISE/ISE-PIC server is synchronized with the time on the Firepower Management Center. If the appliances are not synchronized, the system may perform user timeouts at unexpected intervals.

If you notice the system performing user timeouts at unexpected intervals, confirm that the time on your ISE/ISE-PIC, or TS Agent server is synchronized with the time on the Firepower Management Center. If the appliances are not synchronized, the system may perform user timeouts at unexpected intervals.

Symptom: User data for previously-unseen ISE/ISE-PIC users is not displaying in the web interface

After the system detects activity from an ISE/ISE-PIC or TS Agent user whose data is not yet in the database, the system retrieves information about them from the server. In some cases, the system requires additional time to successfully retrieve this information from Microsoft Windows servers. Until the data retrieval succeeds, activity seen by the ISE/ISE-PIC, or TS Agent user is not displayed in the web interface.

Note that this can also prevent the system from handling the user's traffic using access control rules.

Symptom: User data in events is unexpected

If you notice user or user activity events contain unexpected IP addresses, check your realms. The system does not support configuring multiple realms with the same AD Primary Domain value.

Symptom: Users originating from terminal server logins are not uniquely identified by the system

If your deployment includes a terminal server and you have a realm configured for one or more servers connected to the terminal server, you must deploy the Cisco Terminal Services (TS) Agent to accurately report user logins in terminal server environments. When installed and configured, the TS Agent assigns unique ports to individual users so the system can uniquely identify those users in the web interface.

For more information about the TS Agent, see the Cisco Terminal Services (TS) Agent Guide.

Detect Realm or User Mismatches

This section discusses how to detect realm or user mismatches, which are defined as:

  • User mismatch: A user is reported to the FMC without being downloaded.

    A typical reason for a user mismatch is that the user belongs to a group you have excluded from being downloaded to the FMC. Review the information discussed in Firepower Management Center Device Configuration Guide.

  • Realm mismatch: A user logs into a domain that corresponds to a realm not known to the FMC.

For additional details, see Troubleshoot Realms and User Downloads.

Unknown users that do not match identity rules have no policies applied to them. (Although you can set up identity rules for Unknown users, we recommend keeping the number of rules to a minimum by identifying users and realms correctly.)

Procedure

Step 1

Enable detection of realm or user mismatches:

  1. Log in to the FMC if you have not already done so.

  2. Click System > Health > Policy.

  3. Create a new health policy or edit an existing one.

  4. On the Editing Policy page, set a Policy Runtime Interval.

    This is the frequency at which all health monitor tasks run.

  5. In the left pane, click Realm.

  6. Enter the following information:

    • Enabled: Click On

    • Warning Users match threshold %: The percentage of either realm mismatches or user mismatches that triggers a warning in the Health Monitor. For more information, see Troubleshoot Realms and User Downloads.

  7. At the bottom of the page, click Save Policy & Exit.

  8. Apply the health policy to managed devices as discussed in Applying Health Policies in the Firepower Management Center Administration Guide.

Step 2

View user and realm mismatches in any of the following ways:

  • If the warning threshold is exceeded, click Warning > Health in the top navigation of the FMC. This opens the Health Monitor.

  • Click System > Health > Monitor.

Step 3

On the Health Monitor page, in the Display column, expand Realm: Domain or Realm: User to view details about the mismatch.

Troubleshoot Cross-Domain Trust

Typical issues with troubleshooting the FMC configuration for cross-domain trust include the following:

  • Not adding realms or directories for all forests that have shared groups.

  • Configure a realm to exclude users from being downloaded and those users are referenced in a group in a different realm.

  • Certain temporary issues.

Understand the issues

If there are issues with the FMC being able to synchronize users and groups with your Active Directory forests, the Sync Results tab page is displayed similar to the following.

You can troubleshoot user download errors when users are stored in different Active Directory repositories. Read the columns left to right. Click the triangular icon to get more information.

The following table explains how to interpret the information.

Column

Meaning

Realms

Displays all realms configured in the system. Click Refresh (refresh icon) to update the list of realms.

Yellow Triangle (yellow triangle icon) is displayed to indicate issues in the realm.

Nothing is displayed next to a realm if all users and groups synchronized successfully.

Groups

Click Groups to display all groups in the realm. As with realms, Yellow Triangle (yellow triangle icon) is displayed to indicate issues.

Click Yellow Triangle (yellow triangle icon) to see more detail about the issue.

Users

Click Users to display all users, sorted by group.

Users contained in the selected group

Displays all users in the group you selected in the Groups column. Clicking Yellow Triangle (yellow triangle icon) displays more information to the right of the table.

Groups that contain selected user

Displays all groups the selected user belongs to. Clicking Yellow Triangle (yellow triangle icon) displays more information to the right of the table.

Error detail information (displayed to the right of the table).

The system displays the NetBIOS forest name and group name it could not synchronize. Typical reasons the system cannot synchronize these users and groups follow:

  • Problem: The forest containing the groups and users do not have corresponding realms configured in the FMC.

    Solution: Add a realm for the forest that contains the group as discussed in Create an LDAP Realm or an Active Directory Realm and Realm Directory.

  • Problem: You excluded groups from being downloaded to the FMC.

    Solution: Click the Realms tab page, click Edit (edit icon), then move the indicated group or user from the Excluded Groups and Users list.

Try downloading users and groups again

If there is a possibility the issues are temporary, download users and groups for all realms.

  1. If you haven't done so already, log in to the FMC.

  2. Click System (system gear icon) > Integration > Realms.

  3. Click Download (download icon).

  4. Click the Sync Results tab page.

  5. If no indicator is displayed for entries in the Realms column, the issues have been resolved.

Add a realm for all forests

Make sure you configured:

  • FMC realm for each forest that has users you want to use in identity policies.

  • FMC directory for each domain controller in that forest with users you want to use in identity polices.

The following figure shows an example.

To avoid issues with your identity deployment, make sure you either configure one realm per Active Directory forest or one directory for each Active Directory domain controller.

History for Realms

Feature

Minimum FMC

Minimum FTD

Details

Cross-domain trust for Active Directory domains.

7.2.0

7.0.0

A grouping of Microsoft Active Directory (AD) domains that trust each other is commonly referred to as a forest. This trust relationship can enable domains to access each other's resources in different ways. For example, a user account defined in domain A can be marked as a member of a group defined in domain B.

The FMC can get users from Active Directory forests for identity rules.

Realm sequences.

7.2.0

6.7.0

A realm sequence is an ordered list of two or more realms to which to apply identity rules. When you associate a realm sequence with an identity policy, the Firepower System searches the Active Directory domains in order from first to last as specified in the realm sequence.

New/modified screens: System (system gear icon) > Integration > Realms > Realm Sequences

Realms for user control.

7.2.0

Any

A realm is a connection between the FMC either an Active Directory or LDAP user repository.