I'm seeing the weirdest thing here. I have a couple of RHEL3, 4 and 5 machines that validate user credentials through Kerberos with an Active Directoy domain controller as their KDC.

This works for all of my users, save one. There is one account that is unable to log into RHEL3 Linux machines and generates the following errors there:

May 31 13:53:19 mybox sshd(pam_unix)[7186]: authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=10.0.0.1  user=user
May 31 13:53:20 mybox sshd[7186]: pam_krb5: TGT verification failed for `user'
May 31 13:53:20 mybox sshd[7186]: pam_krb5: authentication fails for `user'

Other accounts, like my own, are fine:

May 31 17:25:30 mybox sshd(pam_unix)[12913]: authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=10.0.0.1  user=myuser
May 31 17:25:31 mybox sshd[12913]: pam_krb5: TGT for myuser successfully verified
May 31 17:25:31 mybox sshd[12913]: pam_krb5: authentication succeeds for `myuser'
May 31 17:25:31 mybox sshd(pam_unix)[12915]: session opened for user myuser by (uid=0)

As you can see, TGT validation fails. This only happens for this specific account, not for any other.

The failing useraccount's password has been reset, I inspected both user objects in Active Directory, but I see nothing out of the ordinary.

If I have the failing useraccount log into a RHEL4 or 5 box, there is not problem, so it must be RHEL3 specific, but the fact that only one account suffers from this, alludes me. Maybe someone has seen this before?