To enable or disable Kerberos authentication, run pam-auth-update from a command prompt. Heimdal is a slightly newer player to the game, and like MIT, contains full support for Kerberos 5, Kerberos 4, and the ticket translator. If any other info'd be useful, I'm happy to provide. Start your free trial. Troubleshooting Kerberos is fairly fault-tolerant, if the requisite services are in place.
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