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Add whitelist and password option for LAN game

Currently, when you open a world to LAN in Minecraft Java Edition, anyone on the same network can join without restrictions. It would be very useful to have an option to enable a whitelist or set a simple password for LAN servers. This would improve security and allow players to control exactly who can join their LAN world, similar to how whitelists work on dedicated servers.

For example, I recently opened a LAN world to play with my 6-year-old child. Suddenly, another player managed to join without our permission and started griefing: they spawned entities, destroyed builds, and ruined the world we had been working on together. This was very upsetting for my child and shows how vulnerable LAN play can be without any protection.

Adding even a simple whitelist or password option would prevent situations like this and make LAN play much safer and more enjoyable, especially for families.

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    Heavy agree! Many server owners don’t realize their server is discoverable and vulnerable. People actively use scan‑bots to find servers using default MOTDs like “A Minecraft Server” and without a whitelist. 

    By changing the default server setting so that whitelist is enabled from day one, we teach server owners that this configuration exists in the first place and dramatically reduce risk, by thwarting these bad actors.