Introduction I was getting problems with hung NFS mounts on some Red hat boxes. Busy boxes so didn’t want to reboot. Fix The fix was a good one. I forced unmounted the problem mount using: umount -lf found via: http://joelinoff.com/blog/?p=356
NFSv3 Ports through a firewall
Introduction If you need to use NFS through any security boundary then you will need to know the ports for NFSv3 to add to your ACLs or firewall rule sets. Protocol NFS uses TCP and UDP Ports The standard ports