GSSD for NFS considers every Kerberos ticket as invalid which contains no TGT

The gssd (client-side) considers every ticket-cache as invalid (corrupt) which contains no TGT, which in reality shouldn't be necessary to access NFS-mounts, as the Kerberos protocol describes.

I am using an Kerberos ticket-cache containing a valid service-ticket for my NFS-Server, but I'm getting an error from my gssd and I cannot access the NFS-Server. If i have a TGT inside the same cache it works fine.

The krb5ccname variable is set to the created cache-file.

Also See:

https://www.spinics.net/lists/linux-nfs/msg17024.html
(same problem as mine but tryin to fix the described code-lines didn't help either)