Authentication error: why = GSS-API context problem …

Hi,

I have Networker server V 8.9.1.1 - build 360  on a Windows 2008-R2 server called S-OLAF-CBLGT:

I get the following message (even after starting my whole server) and when entering into the Networker console:

Unable to connect to server: Unable to authenticate with server s-olaf-cblgt.cbis.olaf: Authentication error:; why = GSS-API context problem …

How can this be fixed ?

My whole Networker environment feels unstable ..... After startup of the server i manually have to re-add my lybrary to be seen ...

Does this ring a bell ?

Regards,

Johan