My guess is that your firewall is blocking port 3389, which is for the Remote Desktop Protocol. As for encryption, Terminal Services does not actually use SSL. If you read the documentation available at Microsoft's Web site, it describes both the required port and a description of how it does encryption.
Dig deeper on Security Resources
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.