Kerberos is a network authentication protocol for client/server applications that uses encrypted tickets passed through a central Key Distribution Center to verify the identity of a user or service requesting access. Because Kerberos is an industry standard and a secure network authentication mechanism, you may already have UNIX programs and services that are configured to use it. To allow those existing Kerberized applications to work with Active Directory without manual configuration, the adclient process automatically creates and maintains the Kerberos configuration file, krb5.conf, and the krb5.keytab service ticket file to point Kerberos-enabled services and applications to the Key Distribution Center (KDC) in Active Directory when you join a domain.
The configuration file is initially created using information collected by probing DNS and Active Directory with the default domain set to the domain that the computer has joined. Whenever a logon or ticket validation is performed with a domain that is not in the configuration file, the configuration file is updated so that it includes the new domain. Although the adclient process can automatically update the file as needed, it does not destroy existing configuration entries that you may have added by hand. Because of this, Centrify agents work seamlessly with existing Kerberos-enabled applications.
Note: Centrify Authentication Servicesupports users defined in a Kerberos realm as long as the Kerberos domains or realms are resolvable by DNS. Kerberos realm names are case sensitive, so be careful to check that the realm spelling and capitalization is correct. (Ref: CS-21846a )