Alternative Authentication Neoforge Port

A server running the port checks each joining player against a list of authentication providers, in an order set in the configuration file. By default Mojang is checked first. When Mojang cannot authenticate a joining player, the mod moves on to the next provider in the configured list, for example Ely.by, so a server accepts both account types and Mojang's own login remains in use.

Providers can be added, removed and reordered in the configuration file. Support extends to player textures served by third-party skin servers, to fetching extra player properties during login, and to the whitelist, which resolves players through the configured providers before adding them. Secure chat profile enforcement from Mojang is disabled for players who use third-party providers, since those providers usually cannot supply it.

The mod is server-side only, so players join without installing it. Players who want to join through a third-party provider need a compatible launcher that uses authlib-injector. Files cover 1.21.1 only, with NeoForge as the loader. The port is an unofficial continuation of work originally created by GGSkyOne, and the code is open source under the MIT License.