When connection established, and user working with it, suddenly remote screen stops to update, so it seems that connection hangs, user trying to interact with UI on remote desktop, but can't see any responce. But when he reconnects, he can see that state was changed (some windows moved, minimised, closed, as user wanted before, or some text typed), so it seems that remmina just been stopped to show new screen changes, but was able to send user actions to remote server and connection was still alive.
This problem seems reproducible with all Windows 7 and Windows 2008 RDP Terminal servers.
It happens when user working with terminal, but it also happens, when you minimize remmina rdp connection window for some time(about 10-20 minutes)
Seems that some changes in RDP protocol in W7/W2008 causes this. So rdp plugin should be updated.
Affected Ubuntu 11.04 and 11.10 for sure. May be previous distros too.
Status changed to 'Confirmed' because the bug affects multiple users.