Topic on Project:Support desk

I setup the media wiki with SimpleSAML extension ready. I can log into the wiki. However, every time when the cookie is expired, the page will ask me to clear the cache with following messages. Is there something wrong in settings? I went through http://www.mediawiki.org/wiki/Manual:System_administration but didn't find obvious variable to make it right. Idea?

Clear the cache of this page? [OK button] Purging a page clears the cache and forces the most current revision to appear.

That message appears when you add the ?action=purge to the URL and you're not logged in. It may be a problem with that extension or other.