LTS Auth
by LTS Team
LTS Auth is a Forge server mod that asks players to register and log in before they can take part in the world.
What it does
Authentication runs on the server, so players who join the server must register once and log in on later visits using simple chat commands. The mod is aimed at larger servers that want account checks without storing password hashes in a separate system. Player accounts are kept in a plain JSON file, which server owners can open and edit directly.
Until a player logs in, the game holds that player in place and blocks interaction with the world, so unauthenticated players cannot break or place blocks. A player who does not finish authentication within 60 seconds is disconnected automatically. The mod is installed by placing its file in the mods folder of a Forge 1.20.1 server, and it runs only on the server side.
LTS Auth is released under the All rights reserved license and is not open source, although public links exist for the source code and the issue tracker. Its first file appeared on 2026-02-01, and the latest Forge build for 1.20.1 is 1.0.1+mc1.20.1, published on 2026-06-18.
Key features
Register and log in
Players create an account with a simple command and log in with it on later joins.
Frozen until authenticated
Players who have not logged in stay held in place and are blocked from changing anything in the world.
Automatic timeout
A player who fails to authenticate within 60 seconds is kicked from the server.
Readable account file
Accounts are saved in a JSON file that server owners can open and adjust directly.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Public servers without hashes
Server owners who want a login step on a large server, with account data kept in a readable file.
Who it’s for: Server owners running Forge 1.20.1 who want players to register and log in before playing. Players only need the server to run the mod, since it is server-side only.
How it compares
Spawn Egg And Spawner Auth is a server-side Forge mod for 1.20.1 under All rights reserved, not open source. OfflineAuth is also server-side and open source under the GNU Lesser General Public License v3.0 only, and it covers 1.20.1 – 1.20.6. TAuth is open source under the MIT License for 1.20.1, and it is server required with the client optional, so players may add it.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| LTS Auth | Forge | 1.20.1 | Server-side only | 2026-06-18 |
| Spawn Egg And Spawner Auth | Forge | 1.20.1 | Server-side only | 2025-10-25 |
| OfflineAuth | Forge | 1.20.1 – 1.20.6 | Server-side only | 2025-10-31 |
| TAuth | Forge | 1.20.1 | Server required, client optional | 2026-07-27 |
Questions
Does LTS Auth need to be installed on the client?
Which Forge version does LTS Auth support?
Where are player accounts stored?
In the catalog
LTS Auth is one of 8,016 Management mods on ModsFinder, and one of 2,698 Management mods for Forge. 34,764 mods support Minecraft 1.20.1.
More from LTS Team
Similar mods
What the author says
A server-side authentication mod for Minecraft Forge 1.20.1. The mod stores player data in config/lts_auth/players.json.
Official listing
- Modrinth page
- modrinth.com/mod/lts-auth
- Owner
- LTS Team
- Published
- 2026-02-01
- Updated on Modrinth
- 2026-06-18
- Facts verified
- 2026-10-15