Windows Server Core 2022 Tips & Tricks - How to change RDP port number and Block old port
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Block RDP port number 3389 :
wf.msc
Inbound
Block 3389
CHANGE RDP PORT :
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp
After that, double-click on the PortNumber in the RDP-TCP folder.
Select the Decimal option in the Edit DWORD(32-bit) value box and type a new port number.
NOW ALLOW THIS PORT ON FIREWALL :
wf.msc
Inbound