See the URL given above. Error was reported on the French village pump at the Commons,
The page User:Sting just is not served. After a loooong time (about 4-5 minutes), one gets a WikiMedia error page saying
Request: GET http://commons.wikimedia.org/wiki/User:Sting, from <MY IP OMITTED> via amssq43.esams.wikimedia.org (squid/2.7.STABLE7) to 18.104.22.168 (22.214.171.124)
Error: ERR_READ_TIMEOUT, errno [No Error] at Thu, 17 Feb 2011 20:09:23 GMT
The user's page contains quite a few images. Don't know if that might be a problem.
Behavior confirmed in Firefox 3.6.13 (Mac OS X), Safari (Mac OS X), Firefox 3.6.4 (Win XP), IE6, Opera 10.60 (Win XP); both logged in and logged out.
The page is also not served through the secure server
it returns relatively quickly a completely unstyled page saying
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /wikipedia/commons/wiki/User:Sting.
Reason: Error reading from remote server
Apache/2.2.8 (Ubuntu) mod_fastcgi/2.4.6 PHP/5.2.4-2ubuntu5.12wm1 with Suhosin-Patch mod_ssl/2.2.8 OpenSSL/0.9.8g Server at secure.wikimedia.org Port 443
Marked as "major" because although so far this concerns only one page, I think it's worth investigating before we find other pages. It's not clear to me whether this is some networking problem, or a caching (squid) problem, or a wikitext parsing problem, or some other problem in the MediaWiki code.