User blog comment:Dopp/Technical Update: July 26, 2011/@comment-3416406-20110726183839/@comment-3388044-20110727055402

Some people are having success using the following:

 http://NAMEOFWIKI.wikia.com/wiki/Special:Chat?nosockets=1 

where  NAMEOFWIKI  is just that, the name of the wiki you are on when trying to connect to chat.