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Memcache::connect() [<a href='memcache.connect'>memcache.connect</a>]: Can't connect to localhost:11212, Connection refused (111) in /.../sites/all/modules/memcache/dmemcache.inc on line 306.
I'm getting the above error when an anonymous visitor tries to access a 403 page (access denied)... plus, the visitor never receives any page content. If a user is logged in, there is no problem. Likewise, if the anonymous visitor tries to access a normal (non-access-denied) page, there is no problem.
I'm tagging this as a support request, because I may have some configuration error... but Memcache Admin shows it's hitting the cache when I'm monitoring different pages on the site, so I know memcache is working...