Configuring LDAP Authentication

You can configure the Citrix Gateway to authenticate user access with one or more LDAP servers.

LDAP authorization requires identical group names in the Active Directory, on the LDAP server, and on the Citrix Gateway. The characters and case must also match.

By default, LDAP authentication is secure by using Secure Sockets Layer (SSL) or Transport Layer Security (TLS). There are two types of secure LDAP connections. With one type, the LDAP server accepts the SSL or TLS connections on a port separate from the port that the LDAP server uses to accept clear LDAP connections. After users establish the SSL or TLS connections, LDAP traffic can be sent over the connection.

The port numbers for LDAP connections are:

• 389 for unsecured LDAP connections
• 636 for secure LDAP connections
• 3268 for Microsoft unsecure LDAP connections
• 3269 for Microsoft secure LDAP connections

The second type of secure LDAP connections uses the StartTLS command and uses port number 389. If you configure port numbers 389 or 3268 on Citrix Gateway, the server tries to use StartTLS to make the connection. If you use any other port number, the server attempts to make connections by using SSL or TLS. If the server cannot use StartTLS, SSL, or TLS, the connection fails.

If you specify the root directory of the LDAP server, Citrix Gateway searches all the subdirectories to find the user attribute. In large directories, this approach can affect performance. For this reason, Citrix recommends that you use a specific organizational unit (OU).

The following table contains examples of user attribute fields for LDAP servers:

This table contains examples of the base DN:

The following table contains examples of bind DN:

Note: For more information regarding LDAP server settings, see Determining Attributes in Your LDAP Directory.