Smoething has gone wrong ! Do you filter incoming IP addresses?

Today I was working with site and all of a sudden I got your "Something has gone wrong" page. At first I thought it is server maintenance but now that I checked with an other IP I have your site. What's going on?
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which site?
grep is your friend.
@x00 , vanillaforums.org
http://vanillaforums.org/discussion/26149/vanillaforums-org-has-a-new-home#latest