It's a server file issue I think. We both tried to host and it doesn't work. We can log on to Localhost but we can't connect to eachother. Like I said, Vanilla works fine so the connection is ok.
Not sure where to put this but I have set up a server on my PC for me and a friend. Everything works fine for vanilla but when trying to run Crashlanding server, he can not connect. He gets timed out error and I have nothing on the log