[OpenAFS] aklog Principal not found

[Matthias Teege]

Moin,

I use the openafs client on a Linux system. I can get an afs token with 
aklog -c mteege.de -k mteege.de. Aklog without any parameter gives me an 
error like this:

; aklog -d
Authenticating to cell mteege.de (server xon.mteege.de).
We've deduced that we need to authenticate to realm MTEEGE.DE.
Getting tickets: afs/mteege.de@MTEEGE.DE
Principal not found, trying alternate service name: afs@MTEEGE.DE
Kerberos error code returned by get_cred: -1765328377
aklog: Couldn't get mteege.de AFS tickets:
aklog: unknown RPC error (-1765328377) while getting AFS tickets

What causes this error message?
Matthias