If you put the server's IP address (or DNS name) below, it will show all NFS mounts available to your machine
showmount -e serverip

I had a situation where an application (subversion) would hang. Took a while to track down. Turns out, subversion locks files on checkout, update and commit (sound reasonable) and, it will wait forever for the lock.

My server (FreeBSD) had lockd installed but I had never started it. Following command showed me that, so I started it, and all of a sudden, subversion got its lock and did its thing.

service lockd status