Have you tried refreshing the page (hit the F5) key while you're on the site. It might be your computer thinking it's still offline even though it works. No one else has reported not being able to access HITS. If the problem continues please post the following details.
Who is your ISP?
What kind of connection do you have (Cable, DSL, dialup)?
What browser are you using (Internet Explorer, Firefox, Chrome)?
What operating system (Windows XP, Vista, 7, Mac os X)?
Thanks.