Failed to synchronize registry data from server, closing connection

The Aternos forums are now deprecated

Learn more about this change here.

For help regarding Aternos, we recommend you to visit our support center.

    Make sure that the exact same mods installed on both your PC and the server. It is not enough to simply have the same mods installed, they must also be installed in the exact same version. Likewise, the version of the mod loader (Fabric/Forge) must be identical.