Answered: Is RDP UDP or TCP? - AnyViewer

3389 port tcp or udp RDP servers are built into the server and professional editions of Windows operating systems but not home editions; an RDP server for Unix and OS X also exists (for example xrdp). By default, the server listens on TCP port 3389 [2] and UDP port 3389. [3].

3389 port number  Likewise, what is port 3389 commonly used for? Port 3389 Basics TCP Port 3389 is used for the Windows Remote Desktop Protocol (RDP) and is also sometimes used by Windows Terminal Server. You may choose to allow or open this port in Windows Firewall to give another computer, either on the same network or another network, access to your computer.

3389 port forwarding  This article provides a comprehensive guide to RDP network ports, with a focus on TCP and UDP protocols.