Go to Regedit,
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp.
Change the PortNumber value from 00000D3D (hexadecimal for port 3389) to 000001BB (hexadecimal for port 443).
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Go to Regedit,
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp.
Change the PortNumber value from 00000D3D (hexadecimal for port 3389) to 000001BB (hexadecimal for port 443).