Wikipedia:Wikimedia Foundation error

The common "Wikimedia Foundation error" message (WFEM) is sometimes called a "server error" but might be caused by a recent edit which a user made to the current page being displayed. The message is an indication that the webpage being processed for display could not be completely formatted within the time allotted, typically 60 seconds. It rarely indicates that there is a fatal problem with an actual file server at the Wikimedia Foundation, which has been preparing the webpage.

(The message should be accompanied with:

If you report this error to the Wikimedia Administrators, please include the details below.

Error: 503, Backend fetch failed at DDD, dd mmm ccyy hh:mm:ss GMT.