OS Ubuntu 606 server

After I restarted one of my servers this afternoon (down to change out a
failing CD/DVD drive) I am unable to mount an nfs directory. This was
mounted before the shut down, for some time, and as far as I am aware, I
have chnged nothing on either machine, other than the aforementiond cd
drive.

Now when I issue the mount command, it sits there for a minute or so, an
then comes back with the message

Mount: RPC: Timed out

and the remote share is not mounted. I have checked everything I can
think of:

I have the correct IP number for the remote machine
The mount point exists, and has appropriate permissions
The remote share exists, and is listed in /etc/exports
The remote nfsd is running
Both machines are lightly loaded (no run aways), and have plenty of memory
I am logged in as root on the machine where I am trying to do the mount.
I can ping from one machine to the other, both ways.

AS I say, this was working fine until noon today
Anyone seen this, or have a suggestion as to what to try next?

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