http://blogs.msdn.com/maximeb/archive/2009/04/01/non-extended-public-aam-will-not-allow-you-to-set-anonymous-access.aspxI had a customer that was having issues setting the anonymous access.  While they could access the http://contoso/_layouts/setanon.aspx page, they couldn't actually see the link to that page when navigating to the Site Permissions. When they wereen-USCommunityServer 2.1 SP1 (Build: 61025.2)