To change Windows Server default RDP port 3389 to your own port number, please follow below steps:
1) Open powershell in administrator mode.
2) Enter follow command in powershell:
$portvalue = 3490 (Change this to your own port number)
Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp' -name "PortNumber" -Value $portvalue
3) Below lines are to open RDP port inbound direction in TCP and UDP protocol.
New-NetFirewallRule -DisplayName 'RDPPORTLatest-TCP-In' -Profile 'Public' -Direction Inbound -Action Allow -Protocol TCP -LocalPort $portvalue
New-NetFirewallRule -DisplayName 'RDPPORTLatest-UDP-In' -Profile 'Public' -Direction Inbound -Action Allow -Protocol UDP -LocalPort $portvalue
4) Check the port change status
Get-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp' -name "PortNumber"
You will see the changed port number
PortNumber : 3490
PSPath : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal
Server\WinStations\RDP-Tcp
PSParentPath : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal
Server\WinStations
PSChildName : RDP-Tcp
PSDrive : HKLM
PSProvider : Microsoft.PowerShell.Core\Registry
5) Restart your Windows Server to access Remote Desktop with custom port number.
Source: https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/clients/change-listening-port
