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When a new player was whitelisted while they were sitting on the join screen, their next attempt would insta-kick before the world ever loaded, and the retry after that would let them in for roughly 20 seconds before booting them with "connection closed". Two separate bugs were colliding. The first kick was a stale cancel flag on the client. When the server rejects a join, the "Connecting to host..." screen tears down, and its teardown path fires the cancel callback defensively. That flag would latch on without ever being consumed, so the very first tick of the next join attempt saw it and immediately closed the fresh connection. Clearing the flag when a new join starts prevents this. The second kick was an orphan on the server. When the first failed join's TCP dropped, its slot got recycled for the next successful join, but the half-built login object from the broken attempt was still in the pending queue. 30 seconds later its "login took too long" timer fired, and the disconnect packet it tried to send was routed to whoever currently held that slot, which was now the new in-world player. It landed on their live socket and kicked them. Telling the game's Socket layer about the TCP drop lets the orphan clean itself up, and refusing to write on an already-closing socket stops any late packet from leaking into the recycled slot.