Connection Packet Fixer
Relaxes packet limits, errors, timeouts, and other connection related issues
by alchemyyy
NeoForge
- Loaders
- NeoForge
- Downloads on Modrinth
- 1.7K
- Followers on Modrinth
- 1
- version
- 1
- Updated
- June 4, 2026Jun 4
- Published
- in 2026
At a glance
Runs on NeoForge
For Minecraft 1.21.1
Needed in the game and on the server
Latest version — 1.0.0 from June 4, 2026
License MIT — free
Where it's neededGame versions1.21.1
In gamerequiredOn serverrequired
Needed both in the game and on the server
Connection Packet Fixer
Relaxes packet limits, connection timeouts, packet decode exceptions, and payload issues.
Details
- Raises common login, compression, chunk, and NBT packet limits.
- Extends login, read, and keepalive timeouts.
- Bounds slow disconnect cleanup so closed channels do not hang forever.
- Blocks repeated malformed pre-login traffic.
- Can suppress client disconnects from signed chat verification failures.
FAQ
How to install Connection Packet Fixer?
Install NeoForge for your Minecraft version, download Connection Packet Fixer for the same version and loader, put the file into the mods folder and launch the game with the loader profile.
Which Minecraft versions does Connection Packet Fixer support?
Connection Packet Fixer has builds for Minecraft 1.21.1.
Is Connection Packet Fixer needed on the server?
Needed in the game and on the server
License and source
MIT Licensefree to use and share with credit to the author
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