What's interesting is that it's SecurityFocus (hosters of the BugTraq lists). I wonder if they are under attack at this point. I tried to reconnect, I got a blank page and "page contains no data". I hit refresh and then got the "Firewall Error: Forbidden".

It's definately them having an issue but I have concerns that it's more serious than a simple misconfig.

[edit]

Further to this, a search at Google reveals their main page was last updated on the 4th.