regedit
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp\PortNumber
https://go.microsoft.com/?linkid=9759545
MicrosoftFixit50595.msi
192.168.1.100:3390
兩法同樣適用於 Vista、XP、Server 2003/2008。