I'm also getting the problem with the server Kicking me from game as soon as I try to join. I have only got a base exile running on my local machine, no mods loaded at this stage. My client is fine as I can join other Clementine servers even the OP's one without a problem.
I followed the guide step by step and even did it twice just to make sure. The server runs up, it starts up without any problems and when I join I just get the message "You were kicked from the game"
I see I'm not the only one with this issue, but I've searched and searched and there doesnt seem to be a resolution. All the logs say is Player Connecting, Player connected, player disconnected.
I'm at a loss. Any help or advice would be greatly appreciated. Also as a side point I can only see this server under LAN, do I need to port forward through my router to be able to see my server on the global list?