Description
3389 port tcp or udp TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP. UDP ports use the Datagram Protocol..
3389 port number used for You should open TCP and UDP 3389 (unless you specified a custom port). While the accepted answer (only TCP 3389) used to be correct at the time, it is no longer up to date.
port 3389 open Microsoft’s Remote Desktop Protocol (RDP) enables users to establish remote connections to other computers over TCP AND UDP port 3389. RDP supports UDP for improved performance. Microsoft favours using UDP alongside TCP to enhance responsiveness and reduce latency during remote sessions.