First off: should be fixed now, so try logging in!

This was caused by vBulletin's 15-minute failed login ban table storing the address of our reverse proxy rather than your forwarded IP address. What this effectively meant was that it took one person to mistype their password X amount of times and the entire site would be banned for 15 minutes.

Please accept my apologies for the downtime, I'm working on a fix so it doesn't happen again.

Cheers,

Darian