For the past 2 days now someone has been going on my server and causing a mess. Removing everyone from my groups, rewritting my banlists, banning me from my own server, unbinding everyone's keys, deleting my ULX logs, etc. And I think he caused my internet to go down for a bit as well. Even if I try banning his steamid, he somehow comes in with a completely new one (That or there's a group of people doing this), I ended up banning 5 id's in an hours.
Is there anyway I can stop this from happening?