Troubleshooting Windows RDP Connection

To cut a long story short, the first thing to do is try and create an RDP connection locally, to rule out external firewalling and routing. The problem was that even though "Terminal Services" was up and running, "Don't allow connections to this computer" was selected under "System Properties" -> "Remote". Selecting "Allow connections from computers running any version of Remote Desktop (less secure)" resolved the problem. Not exactly intuitive...

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