Have you been in a situation where you need to remotely connect to some workplace and do some administrator stuff, but can not because Remote Desktop is not enabled and the user who is near that PC has no admin rights to enable Remote Desktop?
So here is what you do (Windows Server 2008 R2 in this case):
Connect to your domain controller -> Open Group Policy Management Editor
Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Connections
Enable: Allow users to connect remotely using Remote Desktop Services
Also you might need to add an exception to Windows Firewall, to do this via Group Policy navigate to:
Computer Configuration > Administrative Templates > Network > Network Connections > Windows Firewall > Domain Profile
Enable: Windows Firewall: Allow inbound Remote Desktop exceptions