MAnoXY

But whitelist doesn't solve my problem.

Something like ingame "/login pass", but using "key" instead of logging.

How I said, I have client-side where will be stored something like a key, and server-side where will be the key received and checked if match. If yes, the player will be allowed to connect, else connection will be dropped... And I need to check it before the connection is completed.

Hello, I would like to ask for help, would it be somehow possible to detect exactly moment when player logging to the server (only multiplayer) and send to the server some data before logging in? Example: Client sends som "key" to the server if the key match player will be allowed to connect, otherwise will be connection dropped... Thanks for any response or help.