Advanced In the works Updated September 25, 2026

ULX on Garry's Mod

What the ULX admin mod and ULib are, why Garry's Mod servers use them, and how they fit on a SLASHPLAY server: upload into garrysmod/addons and restart.

FULL GUIDE IN THE WORKS

This covers a tool made by others, not part of SLASHPLAY itself. Here is how it works in words; a step-by-step guide with screenshots is on its way. Stuck? Ask us on Discord.

ULX is the admin mod most Garry’s Mod servers run. It gives you an in-game admin menu, user groups with their own permissions, commands like kick, ban, slay, teleport and mute, and logs of what admins did. It needs ULib, a shared library from the same authors. Both are free community addons, not part of Garry’s Mod or SLASHPLAY.

How it fits on SLASHPLAY

ULX and ULib are ordinary Garry’s Mod addons, so they go where every addon goes: garrysmod/addons, which is kept between runs. The general route:

  1. Get ULX and ULib from their official release pages.
  2. Upload both addon folders into garrysmod/addons with the file manager. A .zip can be uploaded and unpacked with Extract here.
  3. Click Restart server on the General tab so Garry’s Mod loads them.
  4. Make yourself a superadmin from the Console tab with ULX’s user command, then manage everyone else from the in-game menu.

ULX is server-side, so your players don’t need to install anything to be managed by it.

What’s kept

The addons themselves live in garrysmod/addons, and ULX and ULib keep their users, groups and bans in garrysmod/data. Both folders are part of your save, so your admins and bans come back after every stop and restore. See What’s kept between runs.

Good to know

  • SLASHPLAY doesn’t review or support third-party addons. If the server won’t start after adding one, the crash box on the server page shows the last output, and deleting the addon and restarting usually fixes it.
  • Garry’s Mod updates automatically on SLASHPLAY. Keep ULX and ULib up to date too.

A full step-by-step guide is coming. Until then, see Addons and gamemodes for how addons work on SLASHPLAY.