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.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as connectionpacketfixer-neoforge-1.21.1-1.0.0.jar — drop this file into the mods folder
- Download size: 38 KB
- Download link checked 8 Sept 2026 — working
These come from our own check of the pack file, not from the source page.