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By default, Windows Remote Desktop uses . However, system administrators often change this port to 3390 (or other high ports) to bypass router conflicts or to add a layer of "security through obscurity" against automated bots scanning the default port.
: Most "brute-force" scripts automatically target the default port; changing it to 3390 helps hide a system from basic scanners. 3390 port
Editing the Windows Registry can cause system instability if done incorrectly. Back up your registry before proceeding.
: On a home or small business network, a router can only forward one specific port to one specific device. Using port 3390 allows a user to access a second computer remotely while keeping port 3389 open for the first. : On a home or small business network,
In the "PC Name" or "Host" field:
, a feature that establishes a direct UDP-based transport between a client and a session host to improve performance and reliability. This is often configured through Group Policy. Alternative RDP Port: Administrators often change the listening port from 3389 to 3390 to reduce the visibility of the service to automated internet bots that specifically scan for the default 3389. Port Forwarding: When connecting to multiple computers on a single network from the internet, a router can be configured to forward port 3389 to the first machine and port 3390 to the second. Virtual Environments: It is sometimes used by default in virtual machine managers like implement the following:
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Changing the port to 3390 is ; it is merely a camouflage tactic. Skilled attackers can easily scan for open ports regardless of the number. To stay safe, implement the following: