Remote Desktop to EC2 Instance on Port 80 or 443

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http://serverfault.com – 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 (HowTos)