Answer Description
SERVICES.MSC is where you change the startup configurations for services in Windows. DXDIAG is a tool for troubleshooting DirectX sound/video issues. Port 3389 is the port for RDP, but the port being blocked was not the issue. Adding the RDP gateway to an adapter is a made up answer.
Wikipedia
Remote Desktop Services (RDS), known as Terminal Services in Windows Server 2008 and earlier, is one of the components of Microsoft Windows that allows a user to take control of a remote computer or virtual machine over a network connection. RDS is Microsoft's implementation of thin client, where Windows software, and the entire desktop of the computer running RDS, are made accessible to a remote client machine that supports Remote Desktop Protocol (RDP). With RDS, …
Remote Desktop Services - Wikipedia, the free encyclopedia