Wikipedia, the über-popular online encyclopedia, went down briefly today. It was unavailable for about 15 minutes, starting at 11:17 CET according to our Pingdom monitoring.
The service was responding with HTTP error 503 (service unavailable) and displayed an error page stating that the Wikimedia servers were experiencing a technical problem (screenshot below).
Wikimedia.org was also down, indicating that Wikimedia had some form of general problem that likely affected all its websites, not just Wikipedia.
It should be mentioned that Wikipedia has a very good availability overall, having only been offline for a total of about 1 hour and 30 minutes in the last six months. They have an uptime of 99.97%.