On 10/03/2021 08:56, George N. White III wrote:
If you did a "df -T" on your system does it show the mount as "nfs" or "nfs4"?If it shows "nfs", it might be helpful to adjust the mount command to use nfs4 for the build-in file locking.
If it shows "nfs" I'm not sure adjusting the mount command would have any effect.
AFAIK, if one uses the generic "mount" command the /etc/nfsmount.conf file is used to determine the first version to try during mount negotiation. The default is 4.
So, I think, if df shows "nfs" that would mean the attempt to mount with version 4 has failed.