Diagnose and change Remote Desctop Service via CLI

Check listener:

• netstat -ano | findstr ":{RDP port}"

Check service:

• sc query TermService
• sc qc TermService

Check registry:

• reg query "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections
• reg query "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber
• reg query "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v fEnableWinStation

Change port:

• reg export "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" C:\rdp-tcp-backup.reg /y
•  reg add "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t R
  EG_DWORD /d {new RDP port} /f

Check from other computer (PowerShell):

•  Test-NetConnection YOUR_PUBLIC_IP -Port {new RDP port}