Comment 8 for bug 241139

I can confirm this bug. I am on a university network, and I can say this error pops up randomly (ie. meaning that some shares will mount, while others will not).
First it gives an error "Unable to mount location", while still showing in the nautilus mounts list, with an "empty" directory list.
Trying to mount again give the obvious "Mountpoint Already registered" error, which is ok.

So, the first mount attempt fails somewhere in the middle.