ModsJava
Version Blocker
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
⬇ Download on ModrinthVersion Blocker – Keep Your Server Safe from Wrong Game Versions
Description:
- Version Blocker is a Velocity proxy plugin that ensures only players with the allowed Minecraft version can connect to your servers. It checks each player's game version and:
- Blocks unsupported versions from accessing your Paper servers.
- Displays a custom message when a player’s version is incorrect.
- Ensures a smooth experience by preventing incompatible clients from joining.
Key Features:
- Enforce a single allowed game version.
- Customizable rejection message.
- Simple configuration and setup.
List of MC protocol : https://minecraft.wiki/w/Minecraft_Wiki:Projects/wiki.vg_merge/Protocol_History
This is a very lightweight and simplistic plugin. No support or feature requests are available.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.7, 1.21.8, 1.21.9
- 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.
File checked by MCModsHub
- Ships as versionblocker-1.0.0.jar — drop this file into the mods folder
- Download size: 5 KB
- Download link checked 21 Oct 2026 — working
These come from our own check of the pack file, not from the source page.