Electrosolt

I have this 1.12.2 Modded Server and I have some of my friends on it. I recently invited another one of my friends, who I don't actually trust completely. I started getting this spam on my server's console after a bit, after stopping it and restarting it it happened again. Is there some sort of bug or should I pick my friends more carefully? [Find Sample of the spam attached, It's just a lot of repetitions of this]

Ah. I found the folder, which I thought was just vanilla. Thanks :3

? Sorry, I'm a bit of a noob at this

Yeah, the thing is, how do I make the client-side config files be the same?

Uh so I made a Forge server (1.12.2) for me and my friends to play on and I want to set up the mod configs for all the mods we're using. When I go into the "config" folder and update all the configs to the settings I want, they don't actually get configurated properly and just act as if the config wasn't there. How do I make it so that the server-side config affects my friends' clients too?