“An update on App Engine URL Fetch problems on June 11, 2013”
https://groups.google.com/d/msg/google-appengine-downtime-notify/daFPJ1JCth4/BrJ0_73jdvcJ
Misconfigured data centre, taken offline. A step up from taking a misconfigured server offline.
" A recent audit of Google network traffic revealed an error in Google’s network routing configuration. The error in the routing configuration was corrected immediately upon discovery. Unfortunately, the correction to the routing configuration did not properly take into account … "