Minecraft Connection Doctor (Java & Bedrock)
Answer three quick questions (edition, where your friends are, and what's going wrong) and get the exact steps to play together: Open to LAN, friends lists, servers, Geyser for Java + Bedrock, or fixes for common join errors.
Runs on your device · nothing uploaded
This tool is code that runs inside your browser. Your files, text and pictures are read here and never sent to a server, so it even works offline once loaded. Signed in? Only what you save to your account (My Kit, wardrobe) or publish is uploaded.
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Common join errors
| Message | Usual cause | Fix |
|---|---|---|
| Outdated client / Outdated server | Different game versions | Use the same version on every device |
| Failed to verify username / Invalid session | Account sign-in problem | Restart the launcher and sign in again |
| Connection timed out | Port closed or server off | Forward port 25565 or use hosting / a tunnel |
| Connection refused | Nothing listening on that address | Check the address, port and that the world or server is running |
| LAN world not showing | Firewall or guest Wi-Fi | Allow Java in the firewall, use Direct Connect |
How to use it
- Pick the edition you and your friends play.
- Say whether everyone is on the same Wi-Fi or in different homes.
- Choose the problem you see, or ask for setup steps.
- Follow the steps, then press Copy steps to send them to your friend.
How it works
Most join problems come from a few causes: different versions, a firewall or guest Wi-Fi blocking LAN discovery, an account sign-in error, or trying to use LAN across the internet. The doctor maps your answers to the fix for that cause.
Questions
Can Java and Bedrock players play together?
Not directly. A Java server with the Geyser plugin lets Bedrock players join it. Realms and Bedrock servers don't accept Java players.
Can I use Open to LAN over the internet?
Not on its own: LAN only works on one network. You need a server friends can reach, a host, Realms, or a tunnelling tool that gives your LAN world a public address.
Why can my friend with an offline account not join?
Vanilla Minecraft checks that every player has a real account. Worlds and servers in online mode won't let offline accounts join.
Related tools
By PickaxeKit Editorial Team. Updated 2026-11-09.