NFS: Protocol not supported (500)

[tad]

Hi,

we have tested a NFS server (v3) and it was working pretty well in our test environment. I placed the machine in our datacenter and try to mount the NFS server again in production and I get the following error:

"mount error: mount.nfs: Protocol not supported (500)"

When I added the NFS mount, the exports where listed. So I guess the NFS server is working fine while it is returning the exports.

this is the config of the mount:

=================
nfs: NFS
export /data
server 10.10.1.123
path /mnt/pve/NFS
maxfiles 1
options vers=3
content backup,vztmpl,images,rootdir,iso
=================

The IP is accessible .

Has anybody any idea what this could be?

Kind regards,

TAD