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 allow a user to take control of a remote computer or virtual machine over a network connection. RDS is Microsoft's implementation of thin client architecture, where Windows software, and the entire desktop of the computer running RDS, are made accessible to any remote client machine that supports Remote Desktop Protocol (RDP). User …
Remote Desktop Services - Wikipedia, the free encyclopedia