Enable remote desktop on a workstation from a domain controller.

On a domain with administrative rights you can use remote registry to enable remote desktop on a domain controller workstation.

1. Open regedit on a member computer or server.

2. On the file menu select "connect to remote registry".

3. Enter the computer name you want to enable remote desktop on.

4. Navigate to the following registry branch:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server

5. Find the fDenyTSConnections key and change it to decimal 0

That's it, sometimes you have try to connect twice before it works.

You could also manage the computer remotely and add users to the Remote Desktop Users Group.