AltAuth has not been updated to recent Minecraft versions. Since Mojang accounts have become completly unusable I have no need anymore for the modification, although the banned and multiplayer disabled accounts functionality should still work.
AltAuth
AltAuth is a solution to allow players with Mojang account, (untested) banned accounts and (untested) multiplayer disabled accounts to join online mode Minecraft servers depending on client and server support. This works by redirecting the session server requests to a proxy specified by the server.
Trusting the AltAuth proxy session server used by the server is required, as a malicious proxy server can use your Minecraft account for up to 48 (Mojang account) or 24 (Microsoft account) hours on ALL servers. You can select in-game which AltAuth proxy servers you trust. A server using AltAuth has to trust its selected AltAuth proxy server that it prevents unauthenticated users from joining. More information on setting up an AltAuth proxy and a technical overview can be found on the GitHub page https://github.com/lixfel/AltAuth.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.19.2
- 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.
- Ships as AltAuth-1.0.0-all.jar — drop this file into the mods folder
- Download size: 41 KB
- Download link checked 25 Sept 2026 — working
These come from our own check of the pack file, not from the source page.