Also ran into this problem

Same here,attempting to work out a solution.

also have this issue

Possibly because of a recent MCC Update. Ultimately we will have to wait for Inferno to make an update as well, really unfortunate as me and my friend were loading it up and I was immediately hit with "Connection Interrupted,"

Yeah, same here. Every time I try to play the mod with my brother, I get the same error message as above. No idea as to why, but might be a MCC update braking it.

Make sure both players have the Multiplayer for CE installed, it solved the problem for me! ;)