Changing the Default RDP Port (3389) on Windows
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Describe
3389 port rdp Simply put, the default port for using the Remote Desktop Protocol is 3389. This port should be open through Windows Firewall to make it RDP accessible within the local area network. If you want to make it accessible over the Internet (which is not safe), the RDP port should be forwarded through the main Internet router to work properly..
3389 port Also, opening UDP port 3389 enables acceleration since RDP 8.0. It is possible to change the port used by the terminal server (or PC which is accessed), see this Microsoft support article: How to change the listening port for Remote Desktop.
3389 port is used for TCP 443 (HTTPS): Required if RDWeb is deployed. TCP and UDP 3389: Standard Remote Desktop Protocol (RDP) port. It can be configured to a different port number on the host and client.