My friend demonspawn and I are playing, first on build 29.4 now on 30.3, he had a server up and running and I joined and we played for about 4 hours until mine crashed out then I couldn't rejoin, and ever since we can not get onto a private server between us, followed info throughout the forum and the guide on reddit, followed each step to the letter and opened up ports and demonspawn can join server but I just can not join any more, anyone help please?