It appears someone changed the whitelisting mode. No one was banned, no one was hacked. It was a pretty low attempt at trying to crash the server/freak me out or whatever, all they did was change the whitelisting mode and the message lol.
Anyway, let me know if you're not whitelisted still, it should be fully fixed now though. I'm hoping you can all get past this as no permanent damage was caused. Forget and play. I'll be back later.