It seems that I can no longer access SMB shares on a couple of NetApp filers I have running SMB on. I can connect to standard Windows Server SMB shares no problem. It's just these NetApp boxes.

Versions of Ubuntu previous to v11.04 work fine. Fedora 15 works fine. Windows clients are fine. Definitely seems to be something with 11.04 but I haven't a clue what to look for. Any ideas?