http://blogs.technet.com/ad/archive/2009/07/10/testing-a-credential-provider.aspxWeeks ago I blogged about how single sign on and credential providers work and a scenario you can run into with them. One reader faced a slightly different scenario but was able to apply that topic toward getting his issue resolved. He had installed aenCommunityServer 2.1 SP1 (Build: 61025.2)