Linux Client fails logon on Solaris server

[Gruber Johannes (IFAT IT OS CS External)]

Hi,

I have a Solaris 9 KDC and a RH Enterprise 3 Client. I would like to do
authentication via Kerberos, the user data are stored in a ldap server.

I have already configured the Client according several manuals and I get a
kerberos ticket.
But if I logon as user, I get the message
pam_krb5: unable to determine uid/gid for user
pam_krb5: authentication fails for 'NOUSER'

What could be the problem? Do I have to logon as kerberos-principal (e.g.
bobo/branch.company.com or as ldap-user?

Regards,
Johannes