Basically the issue is there that on serverstartup the game lags way to much.
The client sends a “I want to login packet” and has a timer running in the background.
Since the server is “Delayed” still startingup the timer runs out and causes the FMLProxyPacket to crash and cancel the loging in attempt.
Basically on serverstartup the game takes to long to load. (Thats why GT6 was a mayor source of this issue, until i told greg to do the “Loading” of his stuff to be done on the first tick when the packetmanager was already loaded so the ProxyPacket is send back to the client)