Debugging a hung connection

[Norman Elton]

I've got an NFSv4 writable mount that seems to be hung. I can do an
"ls", but neither read (cat) nor write (echo) operations succeed. Both
hang until I kill the process. Other clients are able to continue to
read/write without a problem. I've got a packet capture, and there
don't seem be any packets getting dropped by firewall, etc.

I'm not entirely sure how to pin down the problem. I've got PCAPs of a
working and nonworking client. I see NFS4 calls going back and forth,
but am not quite sure what I'm looking at. Is there a good resource to
explain what the different operations mean, and how/where they would
be failing?

Or anyone have other ideas on how to go about pinning down the problem?

Thanks for any help!

Norman Elton
College of William & Mary