Published to Work on May 25, 2017
Under Windows, if you have the message "port already used by the system", you can use this command to determine and stop the blocking process or program :
netstat -ab use to display the already used ports and the executable associated (could be [system]).
netstat -o will display the process PID associated with ports mapping.
Taskkill /PID XXXX /F can force a process or program to stop.