On Wed, 03 May 2023, Chuck Lever III wrote:

quoted

On May 2, 2023, at 7:01 AM, Jiri Slaby [off-list ref] wrote:

quoted

as it breaks nfs3-only servers in 6.3. I.e. /etc/nfs.conf containing:
[nfsd]
vers4=no

Note: Changing the settings in /etc/nfs.conf had no effect
on my server, so I effected the change by stopping the
server and poking values into /proc/fs/nfsd/versions by
hand.

Steve?

Fixed in nfs-utils-2-3-4-rc1~7
  Commit: d68be5d6ae50 ("nfs.conf: fail to disable major NFS version 4 using "vers4=n" in /etc/nfs.conf")

NeilBrown