On the client (as root):
apt-get install --install-recommends linux-generic-hwe-16.04 A specific bug that caused error 45 on READDIR with pNFS was fixed in . Check your version: nfs vlted 45 work
Look for: NFS: v4 server returned error -45 on operation X . If error 45 appears with vers=4.2 or vers=4 , downgrade to a lower version: verbose server:/export /mnt/test
# Check kernel messages dmesg | grep -i nfs | grep -i "45" mount | grep nfs Run a controlled test with verbose output mount -t nfs -o vers=4,verbose server:/export /mnt/test nfs vlted 45 work