Hmm. I see a dozen logins between Sat 18 Jun 2011 02:35:11 PM JST and Sat 18 Jun 2011 02:44:26 PM JST from these IP addresses:

209.200.185.86
209.200.185.87
209.200.185.88
209.200.185.89

Apparently these addresses belong to Prolexic. I think this was about 24 hours before I was locked out of my account (my home IP shows up several times after this), and 38 hours before the crash.

Edit: Maybe this was me logging in while there was some kind of DDoS protection running? Around 2:45 PM JST, I was unable to stay logged in (I'd be immediately logged out after loading the main page), and around 2:59 PM I noticed I was unable to change my password.