I have several client machines running Ubuntu 10.04 that mount home directories from a central NFS server, also running Ubuntu 10.04. Users are authenticated through a central Windows AD using samba and winbind on the client machines.
Recently I get this behavior that when some users log in, the login screen hangs and never takes them to their desktop. If they log in from a terminal, it displays the welcome message, but hangs before their prompt comes up. The NFS mount is attached and active, as I can log in as a local user and ls it. The behavior looks like the client machine is trying to get a lock or read a file and there is no response from the NFS server.
I've looked through the logs and not seen any suspicious entries. I have purged the nfs server and client installations and reinstalled them. I have no idea what to do from here.
The client fstab looks like this:
csfile.stlawu.local:/home/stlawu /home/stlawu nfs rw,hard,intr,noatime,_netdev 0 0
While the server exportfs looks like this:
Any ideas on what I can do to debug/fix this problem?