Ok this time I'm sure it's not me :)
I'm getting alternating this:
------------ ERROR The requested URL could not be retrieved
While trying to retrieve the URL: http://en.wikipedia.org/wiki/
The following error was encountered:
* Valid document was not found in the cache and only-if-cached directive was specified.
You have issued a request with a only-if-cached cache control directive. The document was not found in the cache, or it required revalidation prohibited by only-if-cached directive.
Your cache administrator is nobody. Generated Fri, 18 Aug 2006 17:27:37 GMT by lily.knams.wikimedia.org (squid/2.5.STABLE13) ----------
and the normal donation request page.
Steve