Hi Clint
I've got NFS4 running on F11 and your configuration looks fine to me.
{The Client}
[root@silver ~]# cat /etc/idmapd.conf [General] ... [Mapping]
Nobody-User = nfsnobody Nobody-Group = nfsnobody
You may want to check that nfsnobody is defined on your system and rpc.idmapd is actually running. Also the output from rpcinfo might help.
From /etc/fstab
inf1:/ /test nfs4 auto,rw,nodev,sync,_netdev,proto=tcp,retry=10,rsize=32768,wsize=32768,hard,intr 0 0
I'd probably want to keep things simple while you are testing. Perhaps cut this back to:
inf1:/ /test rw,noatime,sync,hard,intr 0 0
Running tcpdump at both ends while you try to do a directory listing may provide some insight (which process is waiting for a response from whom)
Err grasping at straws ... you may also want to check for any old stuff you may have in /etc/hosts.{allow,deny}.
Hope this helps,
Kal