AttributeFix-Sync

AttributeFix-Sync

Syncs AttributeFix limits from server to client.

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neoforgeoptimization
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About this Mod

AttributeFix Sync

License
NeoForge

AttributeFix Sync is an unofficial addon for the AttributeFix mod, designed to solve the synchronization issue where modified attribute limits on the server are not reflected on the client.

The Problem

In the original AttributeFix, if you modify the upper limit of an attribute (e.g., generic.max_health or generic.attack_damage) in the server configuration:

  1. The Server correctly calculates damage and health based on your config (e.g., capped at 5000).
  2. The Client still uses the default limit (e.g., 1,000,000).
  3. Result: Mods like Jade, WTHIT, or the vanilla health bar display incorrect values because the client isn't aware of the stricter limit enforced by the server.

Features

This mod solves the above problem via packet synchronization:

  • Automatic Synchronization: When a player joins the server, the mod automatically sends all attribute limits (Max Values) configured on the server to the client.
  • In-Memory Patching: Upon receiving the data, the client dynamically modifies the attribute definitions in memory via Mixin.
  • Correct Visualization: Jade, WTHIT, and vanilla bars will now correctly display values based on the actual server limits.
  • Pollution-Free: When the player disconnects, the mod automatically restores the client's attribute limits to their original state, ensuring single-player worlds or other servers are not affected.

Installation & Usage

Dependencies

  • Minecraft: 1.21.1
  • Loader: NeoForge
  • Required Mod: AttributeFix

Usage

  1. Server: Required. No configuration needed. It automatically reads the final values from AttributeFix and sends them to players.
  2. Client: Required. Necessary to receive the synchronization packets.

Configuration

The client configuration file can be found at config/attributefixsync-client.toml.

Option Default Description
enableSync true Whether to accept attribute limit synchronization from the server.
showSyncMessages true Whether to show a chat message when attributes are synchronized.

Note: To change the actual attribute limits (e.g., max health), please edit the AttributeFix config files located in config/attributefix/.

License & Credits

This project is licensed under the MIT License.

  • Core logic is based on the Minecraft NeoForge API.
  • Special thanks to Darkhax for developing the original AttributeFix mod. This mod exists solely as a supplementary tool for it.

This is not an official work by Darkhax. If you have issues related to synchronization, please report them to this repository, not the original author.

Available Versions

AttributeFix-Sync 0.0.2release
MC 1.21.1neoforge
February 2, 2026

How to Install AttributeFix-Sync on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set neoforge Loader

In the panel under "Egg", select the neoforge loader and matching Minecraft version (1.21.1).

3

Install Mod

Open the mod browser in the dashboard and search for "AttributeFix-Sync". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

neoforge

Minecraft Versions

1.21.1

Server-side

Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

AttributeFix-Sync server crashes on startup – what to do?

Most common cause: wrong neoforge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.

Is AttributeFix-Sync compatible with neoforge?

AttributeFix-Sync officially supports neoforge for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with AttributeFix-Sync – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if AttributeFix-Sync consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install AttributeFix-Sync with just one click on your server.

Recommended RAM
4 GBab €8/mo
Min. 3 GB | +1 GB pro 8 Spieler
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NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

1.21.1