It is quite possible this is due to a widespread internet issue affecting several websites today. Check out Kirk's comment for more info: http://community.wikia.com/wiki/User_blog_comment:Rappy_4187/Technical_Update:_October_19,_2016/@comment-Kirkburn-20161021163319?permalink=1136054#comm-1136054
I'm getting notifications about changes to the geekfeminism wiki, and the links all redirect me to http://community.wikia.com/wiki/Community_Central:Not_a_valid_community?from=mail-sendgrid.wikia.com
I don't see how DNS problems would cause that particular error.