How to Enable Remote Desktop Connections on Server Core 2008
At the command prompt type:
CD\Windows\System32 cscript scregedit.wsf /ar 0
If you typed it correctly it will display:
Microsoft Windows Script Host Version 5.7 Copyright (C) Microsoft Corporation. All rights reserved. Registry has been updated..
cscript scregedit.wsf /ar /v
If you did things correctly the server will output:
Microsoft (R) Windows Script Host Version 5.7 Copyright (C) Microsoft Corporation. All rights reserved. System\CurrentControlSet\Control\Terminal Server fDenyTSConnections View registry setting. 0
Next you will have to make sure that the firewall on the server has the propper ports opened to allow remote connections through. You do this by running another command.
C:\Windows\System32>netsh firewall set service type=remotedesktop mode=enable
If done correct it will output: ok