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No knowledge on my part, sorry.
The site is now working fine for me, but I did take a screenshot of the error message I was getting, on the off chance it will be helpful to diagnosing the problem (I'm using Chrome 13.0.782.107 on Windows 7 64-bit):
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I got a 504 error some minutes before 10:44. MathOverflow is back for me now.
Gerhard, 2011.08.13
It sounds like the downtime has resulted from network work at Fog Creek. I got this response when I emailed about it.
Just to confirm: these are a few incidents where the entire site was down for 1-2 hours? If so, it's the network work that Fog Creek has been doing. If you're seeing more frequent, intermittent errors then there's something wrong.
We're starting to work on moving things out of Fog Creek's data center and over to the Stack Exchange servers which should be a bit more stable. I'll let you know when we're a bit closer so we can try to find a low-traffic time to do the final move (it'll involve an hour or two of downtime). We'll also need to change the DNS to point to the new server.
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