Ubuntu Remote Desktop to Windows Server
On your Ubuntu machine, open Terminal Server Client or tsclient, install if not available, using sudo apt-get install tsclient Try giving RDPv5. If unable to get through, you need to change the Terminal Server Settings on Windows Server 2003 R2 machine. Go to Control-Panel->Administrative Tools->Terminal Services Configuration->Connections->RDP-Tcp. Right click for properties. In General tab, under security frame, from the dropdown combo having Security Layer, select RDP Security Layer. If it have SSL, you may not be able to connect from Ubuntu machine, but would be able to go from Windows machine. Below is the snap