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I've been trying to connect to my little brother's LAN world so we can play without having to start fresh. I know it's likely a firewall issue on his computer's side because he can join me without issue, but I cannot join him unless I turn off his firewall, which no one should have to do. I made sure we are on the same network, we can ping each other's PCs. I made sure javaw.exe was allowed on both of our PCs, restarted many times. I can even SEE the world on the server list, but I can't connect for some unknown reason with the firewall.

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