Since I've upgraded to 12.10 (
3.5.0-17.28-generic 3.5.5) the next error appear in
auth.log every time an NFS volume is accessed:
request-key: Cannot find command to construct key
I've found this thread : https://bugs.mageia.org/show_bug.cgi?id=8807
The solution given by Guillaume Rousse helped to get rid of theses error messages.