I have been having this issue for a while now, and I can't find the cause no matter how much I try. For some reason whenever a new player tries to join my modded server, it says on the server console that player joined, and then a few seconds later it says they left. On the client, it just says either "Timed out" or "Disconnected". The weird thing is, if the player keeps trying to connect over and over again, it will eventually work.
I have part of a log here (I couldn't upload all of it because it was too big): https://pastebin.com/5hdxWpKQ This client attempted to join the server 2 times before it let him join on the 3rd time. If anyone could help me figure out why my server is doing this, it would be greatly appreciated. Thanks.