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Error fix guide

Minecraft Internal Exception: io.netty

Meaning: Minecraft lost connection with an io.netty network exception — often timeout or forced disconnect.

The io.netty stack trace appears when the connection times out or the server closes the socket. Check server status, mods, and your network path.

Server or clientUpdated 2026-06-12

io.netty on modded servers

Mod version mismatches often surface as netty disconnects — match client and server mod packs.

How to fix step by step

  1. 1Rejoin the server.
  2. 2Restart Minecraft and router.
  3. 3Match game version and mods to the server.
  4. 4Disable VPN.
  5. 5Lower render distance on weak connections.
  6. 6Ask the server admin if others see the same kick.

How IO-NETTY differs from related codes

  • Error CONNECTION-LOST: Minecraft lost connection to the server or realm mid-session. (server or client)
  • Error DISCONNECTED: Minecraft ended your multiplayer session with a generic disconnected message. (server or client)
  • Error OUTDATED-CLIENT: Your Minecraft client version is older than the multiplayer server. (usually client-side)

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