kerberos nfs home directory, permission denied

[Hui Zhang]

I setup a kerberos-aware nfs server for home directory. The nfs server and ipa server are all rhel7.4. Users can login most clients (rhel6.9 rhel7.3 rhel7.4) without error, but after login some clients, users have no permission to access home directories. They have to kinit first. For some clients (rhel 6.9) , password authentication is disabled. No one can login these clients any more because he cannot access home directory. As an admin, how to help these users wihtout knowing his password.