The problem with a thread like this is that the original poster often omitted sharing information such as there may be 10 users of the MCH and Plex might be running or lots of other remote connections streaming media or backing up data. If you are not the original owner of the MCH, you should do a reset or delete users that you do not recognize.
There may be also a possibility with some network with VPN installed which redirected traffic to relay server.
