Terminal Server Sessions Disabled

I ran into a couple of issues recently where I was no longer able to RDP onto a server. Whenever I tried to login I received an error "Terminal Server Sessions Disabled: Remote logins are currently disabled".

To fix this I opened up regedit, connected to the server in question by using the "Connect Network Registry" option (under "File" in regedit) and browsed to the following key;

HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\WinStationsDisabled

This was set to 1. I changed this to 0 and was able to login again.