Introduction
This one is not immediately obvious. Suddenly a connection that was working fine just stops and all that you get is a generic error message.
Fix
The fix however is simple. Just remove the following file from your home directory
rm ~/.freerdp/known_hosts
That’s all there is to it. Thanks to the Ubuntu forums for the answer:
http://askubuntu.com/questions/157723/cannot-rdp-to-windows-7-with-remmina-on-12-04
Remmina Unable to Connect to RDP Server
