Comment 14 for bug 1979885

After a nfs-server restart, rpc-svcgssd.service - RPC security service for NFS server isn’t started again

so, one get-around is to reinstall 22.04 nfs after each restart

or, the service can be run separately using:
/usr/sbin/rpc.svcgssd -f

When this service is not present for nfs4 krb5p, which it isn’t in 22.04, then
mac OS produces error 61, because it goes looking for nfs3 and other old garbage
or it can say:
error 1
ls: fts_read: Permission denied
…macOS has lots of features like that…

A Linux client will say:
mount.nfs: mount(2): Permission denied

There is no logging or anything so just like Bud Fox you must “just know”