Comment 51 for bug 561210

Tim - yes I was still doing it over the loopback interface. Thanks for that link, I guess that all kind of makes sense.

Part of my problem also stems from the change to autofs5 from autofs4. This has a separate bug (https://bugs.launchpad.net/ubuntu/+source/autofs5/+bug/517139) filed against it. Thus due to the default hosts file installed by Ubuntu you can end up with NFS mounts over the loopback interface. I can work around that issue myself though some additional manual configuration, as suggested in the bug report, but it might be worth pointing out to the autofs bug/people that it results in an unsupported configuration out of the box so to speak.

Many thanks for you help Tim. I think the latest proposed kernel and a bit of manual tweaking will fix the issue I've been having. I'll let everyone comment on if it fixes their issues.