Moin Frank,
On Thu, Oct 24, 2019 at 10:21:31AM +0200, Frank Weißer wrote:
root@K3064-1:/mount tjener:/home0 /mnt
returns
mount.nfs: access denied by server while mounting tjener:/home0
Maybe the netgroup cache has been corrupted for whatever reason?
As you are using Stretch, the 'debian-edu-nscd-netgroup-cache' tool
should still be available. Run 'debian-edu-nscd-netgroup-cache disable'
on the main server and see it that helps.
(Running 'debian-edu-nscd-netgroup-cache enable' would re-enable netgroup
caching.)
Wolfgang