Which TCP port number does Remote Desktop Protocol (RDP) use by default to accept incoming client connections on a Windows host?
21
80
22
3389
Remote Desktop Protocol servers listen on TCP (and UDP) port 3389 by default. When a client starts an RDP session, it tries to connect to the target system on this port; if the port is closed or remapped, the connection will fail unless the client is told to use the alternate port. Other listed ports belong to unrelated protocols: 22 is SSH, 21 is FTP control, and 80 is HTTP.
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