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An unhandled exception of type ‘NetworkCommsDotNet.CommsSetupShutdownException’ occurred in NetworkCommsDotNetComplete.dll
Additional information: It was not possible to open port #PORTNUMBER on [IP]. This endPoint may not support listening or possibly try again using a different port.
The program ‘[8020] PROGRAM.exe: Managed (v4.0.30319)’ has exited with code 0 (0x0).

That’s the message I get on every port tested by a certain user. However, on most clients the program will just find a hell of ports that can be listened on.