I created a small EC2 instance running Windows Server, and opened up ports 80, 443, and 3389. I needed to Remote Desktop into it from work where the outbound firewall only allows 80 and 443. So I modified the registry entry as outlined in this document to have Terminal Server listen on port 443.
However when I tested it by pointing Remote Desktop to the address and port ( ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com:443 ) it wouldn't connect. I was testing this from home, not from work, where a standard connection was working fine before I changed it.
Why not? Could it be that Amazon doesn't allow RDP traffic over ports 80 and 443?
Or, is it possible that Windows Firewall on my desktop is interfering somehow?