More details are in here: RelativityMC/VMP-fabric#36

To fix this I have to disable use_multiple_netty_event_loops on VMP side.

Not only is VMP a dangerous, horribly tested ball of changes, this change is basically snake oil. It claims to "reduce DoS attacks" but in reality it likely makes them worse, since legitimate users are even less likely to be able to log in with this "optimization". In addition. most mods don't expect the event loop to change underneath them, so I wouldn't be surprised if other mods break with this.

I'm not fixing this. Stop using mods of dubious quality.

Not only is VMP a dangerous, horribly tested ball of changes, this change is basically snake oil. It claims to "reduce DoS attacks" but in reality it likely makes them worse, since legitimate users are even less likely to be able to log in with this "optimization". In addition. most mods don't expect the event loop to change underneath them, so I wouldn't be surprised if other mods break with this.

I'm not fixing this. Stop using mods of dubious quality.

Why are you shitting on the dev? I guess you think C2ME is also bad?