I'm not sure why everyone is focusing on the firewall here, I don't see anything in the original message that points towards it. Maybe I missed another post ?<br><br>It seems to me this could be caused by the automatic unmount that automount does after a certain period of inactivity... Not sure why it would not re-mount the NFS share afterwards, but it seems like a likely suspect.
<br><br>How are you mounting the shares, via fstab or automount ? Anything in syslog or messages regarding the share being unmounted ? That's normally a logged event..<br>