Better Compatibility CheckerTells you exactly which mod is mismatched between client + server

Version: 4.0.10 · MC 1.21.1 · NeoForge 21.1.228 · Java 21

About

Vanilla disconnects with "Connection refused" if a mod mismatches between client + server. BCC tells you exactly which mod is wrong + which version is expected, and offers a download link. Saves hours of "but I have ATM10 7.0!"

Things to do

Getting started

Auto-applies on both ends.

Official documentation