Recently tried to delete https://commons.wikimedia.org/wiki/File:Test.svg for cleaning up to remove the versions with unclear copyright status but this didn't work. Unfortunately I discarded the error message. But when attempting to delete a single version, you'll reproducibly get
"Our servers are currently experiencing a technical problem. This is probably temporary and should be fixed soon. Please try again in a few minutes."
Request: POST http://commons.wikimedia.org/w/index.php?title=File:Test.svg&action=delete&oldimage=20111027000548%21Test.svg, from 18.104.22.168 via cp1017.eqiad.wmnet (squid/2.7.STABLE9) to 10.64.0.135 (10.64.0.135)
Error: ERR_READ_TIMEOUT, errno [No Error] at Tue, 11 Sep 2012 21:25:35 GMT
Sorry if this is a dupe, there were 2259 bugs found for "delete page large history timeout" on MediaWiki with status open.