http://lunarmedia.com/blogs/lunarmedia_blog/archive/2008/09/30/step-guide-to-setup-single-sign-on-in-cs.aspxScenario: Two websites (a main and a subdomain) are running on the same IIS but different app pools. CommunityServer is on a subdomain, eg. forum.lunarmedia.com, and is used as the primary membership provider. On the main site eg. lunarmedia.com, we wantenCommunityServer 2007 (Build: 20416.853)