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AuthBack project artwork

CurseForge · Minecraft mod

AuthBack

Allows you play normally even when authentication servers are down

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which AuthBack release should I use?

Updated 6 days ago
Latest stable file authback-1.9.0.jar
Game version 26.3
Loader Fabric

authback-1.9.0.jar targets 26.3 with Fabric. The project page does not say whether this file belongs on the client, dedicated server, or both. All 1 required mods have matching files.

Where it goes

Is AuthBack required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say
Dedicated server Source doesn’t say
Loader for this release Fabric
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does authback-1.9.0.jar need?

authback-1.9.0.jar. Change the file and its required mods may change too.

All 1 required mods have matching files

Install Fabric API first. We found matching files for this game-version and loader setup. 1 comes through another mod in the chain.

2 listed on this file 1 pulled in by one of those mods
Fabric API Needed by authback-1.9.0.jar
required
Matching file found Matched file: [26.3] Fabric API 0.165.0+26.3
Mod Menu Optional for authback-1.9.0.jar
optional
Matching file found Matched file: 21.0.0

1 extra mod was pulled in by another dependency. Indented rows show who needs each one. We only count dependency files that match this setup. A file for another loader does not fill the gap.

Before you install it

Add AuthBack without breaking your instance.

Built for authback-1.9.0.jar. Pick another file and the loader, install side or required mods may change.

  1. 01

    Stick to this file

    Use authback-1.9.0.jar. It targets 26.3 with Fabric; another release may have different loader, side or dependency requirements.

  2. 02

    Bring the mods it needs

    Install Fabric API first. We found matching files for this game-version and loader setup. 1 comes through another mod in the chain.

  3. 03

    Put it on the correct side

    The project page does not say whether this file belongs on the client, dedicated server, or both.

  4. 04

    Pick the file you checked

    Use the “Get this file” button beside authback-1.9.0.jar. It opens that exact file at the source.

About this project

What does AuthBack add?

Allows you to play as normal even when Mojang's authentication servers are down. Additionally also improves the networking behavior.

How does it work?

  1. The responses from Mojang's webservices/API are cached locally for some time.
    If an outage occurs the previously cached responses are used.
    For example this allows for your skin to be displayed properly.
  2. Every client locally stores (or generates if not present) a keypair, which will be used as a fallback to authenticate with servers when Mojang's authentication servers are down (see Public-key cryptography).
    Please note:
    • The server also needs to have the mod installed
    • You must have already joined the server once (during the past 36 days)

The mod is optional for the client and server.
However if one side lacks the mod joining a server will be impossible when Mojang's authentication servers/APIs are down.

You can find more information - like usage guides, FAQ and a list of all options - in the corresponding repository.

Project description from CurseForge.

Pick your setup

AuthBack by Minecraft version and loader

Choose the version and loader you play, then open the matching release.

7 available setups

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files

AuthBack versions and loaders

17 of 17 releases match

Looking for an older file? The official CurseForge project page is in Resources.

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