Crash Exploit Fixer Mod FAQ

Check your server startup log for the mod's load confirmation line, which appears alongside your other mods during boot. If you see it listed without errors, the patch is active and no further setup is needed.

No, the mod works out of the box with sensible defaults and applies its patch automatically on server start. Configuration is only relevant if you're troubleshooting conflicts with other mods.

It's a server-side fix, so only the server needs it installed to protect against the crash exploit. Clients can join without the mod, though keeping it on both sides does no harm.

No, the patch operates on the server's packet handling and doesn't change anything the client needs to understand. Vanilla players can connect normally.

Yes, but Paper already includes its own version of this fix, so running both is redundant rather than harmful. If you're on Paper, you likely don't need this mod at all.

It generally coexists fine with performance and utility mods because it only touches the specific packet path involved in the exploit. If you see unusual join errors after adding it, test by removing other mods one at a time.

The mod only patches the specific join-packet exploit, so crashes from other causes like memory exhaustion or a different exploit won't be stopped. Check your crash log to confirm the cause matches the exploit this mod addresses.

The patch is intentionally minimal and based on tested logic, so performance impact is negligible. You shouldn't see any measurable change in TPS or memory use.

Yes, because Mojang's fix for this exploit was incomplete in that version, which is exactly why this mod exists. Installing it closes the remaining gap.

Have a trusted player attempt the known join-packet crash method on a test server with the mod installed. If the server stays up and the player is simply disconnected or ignored, the patch is working.