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The Remote Desktop client attempts to connect to port 3389 on the server machine.

If you want it to connect to different port you have to specify it in the address, eg. 100.10.10.1:3390

Is there way to change the default port it tries to connect to so that you don't have to specify it in the address?

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2 Answers 2

Unless you can find a registry entry somewhere that contains the default port for RDP sessions, I don't think it is possible to change the default connection port. However, depending on the reason you have it set to use a different port, you may be able to set up a local portproxy on either the host or client machine.

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You can change the portnumber by modifying the registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp\PortNumber

In mstsc you can connect to the host just the way you expected. (eg: 100.10.10.1:3390).

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ZEDA-NL's answer is correct, but what all(!) guides on the Internet, including MS FixIt, forgot to mention is that you have to create a rule in the Windows firewall to let the connection through. –  Momro Dec 15 at 16:02

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