What port does mono's debugger use

I am trying to debug our project on my second machine.
There seem to be a conflict in with the ports monodevelop uses as I am getting the error:
“Could not open port for debugger. Another process may be using the port.”

Does anyone knows which port mono debugger uses on windows 7 or how to find it?

info here https://youtrack.jetbrains.com/issue/RIDER-485