RDP service not running on server

If the server is up and running - connect to a secondary server (Terminal).

Use MMC to open a computer management console on the server - check event logs of server

If you find the following event

Event Type: Error
Event Source: TermService
Event Category: None
Event ID: 1014
Date: 11/11/2009
Time: 3:32:10 PM
User: N/A
Computer: SERVER
Description:
Cannot load illegal module: C:\WINDOWS\system32\rdpwsx.DLL.

You need to run the following on the server to restart the RDP server service.
echo yes | reset session RDP-tcp

For this you need the PsExec command.
URL: http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx

Unzip and open a command prompt in that directory.

Run the following:
psexec \\servername cmd

You will then have a command prompt on the remote server. You should now be able to execute the command on the server.

RDP should now be working on the server.

This particular fix can appear after restarting following applying Windows Updates.