Connectivity Problem with Minecraft - Says Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundsException: index: 14, length

Technical Support
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System Information

Field Value
Operating System Linux - Debian GNU/Linux 12 on x86_64
Product AMP ‘Callisto’ v2.5.1.4 (Mainline)
Virtualization Docker
Application Minecraft
Module MinecraftModule
Running in Container Yes
Current State Ready

Problem Description

Issue

Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundsException: index: 14, length: 105 (expected range(0, 62))

I get this everytinme

Reproduction Steps

  • Login, multiplayer, use ip to login, error.
  • Joining Game
  • Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundsException: index: 14, length: 105 (expected range(0, 62))
1 Like
2

You usually see this error if you’re trying to connect to a vanilla server with a modded client.
Make sure that the server is running the right modloader+version, and that the mods are loading correctly.

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