Bypass Fabric Check

Bypass Fabric Check

A Fabric mod that bypasses the handshake check, allowing Vanilla clients to join Fabric servers.

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fabricoptimizationutility
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About this Mod

Bypass Fabric Check

🇺🇸 English Description

Introduction

This is a simple Fabric mod designed to solve the issue where Vanilla Clients cannot join a LAN/Server with Fabric API installed in Minecraft 1.21+.

Features

  • Bypass Handshake: Intercepts FabricConfigurationTask sent from the server to non-local players.
  • Vanilla Compatibility: Allows friends without any mods to connect directly to your Fabric host.
  • Server-Side Only: Needs to be installed on the Host/Server only. Clients do not need this mod.
  • Toggleable: You can enable or disable the bypass feature dynamically via commands.

Fixes Error

This server requires Fabric Loader and Fabric API installed on your client!

Commands

You can toggle the bypass status using the following commands (Requires OP permission):

  • /bypass on - Enable bypass (Default). Allows Vanilla clients to join.
  • /bypass off - Disable bypass. Restores default Fabric behavior (Vanilla clients will be rejected).

🇨🇳 中文说明

简介

这是一个简单的 Minecraft Fabric 模组,旨在解决 1.21+ 版本中,原版客户端 (Vanilla Client) 无法加入安装了 Fabric API 的局域网 (LAN) 或服务端的问题。

功能特点

  • 绕过握手检查 (Bypass Handshake): 拦截服务端向非本地玩家发送的 FabricConfigurationTask
  • 原版兼容 (Vanilla Compatibility): 允许没有任何模组的朋友直接连接你的 Fabric 主机。
  • 服务端专用 (Server-Side Only): 只需要安装在 Host/服务端,客户端无需安装。
  • 可动态开关: 支持在游戏中通过指令实时开启或关闭绕过功能。

解决了什么报错?

This server requires Fabric Loader and Fabric API installed on your client!

指令说明

你可以通过以下指令控制功能开关(需要 OP 权限):

  • /bypass on - 开启绕过检查(默认)。允许原版客户端加入。
  • /bypass off - 关闭绕过检查。恢复 Fabric 默认行为(原版客户端将被拒绝)。

Available Versions

Bypass-Fabric-Check 1.0.7 for Fabric 1.21.xrelease
MC 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11fabric
December 29, 2025
Bypass-Fabric-Check 1.0.5 for Fabric 1.21.10release
MC 1.21.10fabric
December 27, 2025

How to Install Bypass Fabric Check on Your Server

1

Order Server

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

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

3

Install Mod

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

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.11, 1.21.10, 1.21.9 (+9 more)

Server-side

Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Bypass Fabric Check server crashes on startup – what to do?

Most common cause: wrong fabric 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 (1.21.11). You can switch loaders with one click in the panel.

Is Bypass Fabric Check compatible with fabric?

Bypass Fabric Check officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.9. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Bypass Fabric Check – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Bypass Fabric Check 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.

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Recommended RAM
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Min. 3 GB | +1 GB pro 8 Spieler
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Details

License
GNU General Public License v3.0 or later
Server-side
Required

Supported Versions

1.21.111.21.101.21.91.21.81.21.71.21.61.21.51.21.41.21.31.21.2+2 more