RD Gateway
The Remote Desktop Gateway (RD Gateway) role service allows users to access network resources (like RD Session Host servers, RD Session Host servers running RemoteApp programs, RD Virtualization Host-based virtual machines, or computers with Remote Desktop enabled) that are located behind firewalls in a private network from any Internet-based client (or internally based clients if TCP 3389 is an internally restricted port). To do this, the RD Gateway employs something that is called an SSL relay (also known as an SSL VPN). In short, an SSL relay allows clients to connect to internal resources over a secure, encrypted HTTPS connection. In this case, the traffic that is being passed through the SSL relay is just RDP (TCP 3389).
RD Gateway ...
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