Error 403.18 when I try to access a MS provided sample application

Hi all,

My environment: Windows 2008 R2- 64 bits, .Net 3.5, IIS 7.5. 

I am working with ADFS 2.0 (Federation Services) and was trying to set up a lab by following the document here:http://go.microsoft.com/fwlink/?LinkId=201919

As explained, I could create a sample application with WIF (Identity Federation). But when I try to access the application, I get Error 403.18 - Forbidden. The url in my lab is: https://fsweb.contoso.com:443/ClaimsAwareWebAppWithManagedSTS/default.aspx

I enabled the detailed trace log in IIS7.5 and captured the freb output. The highlight of the output is given. If anyone has any ideas to fix, or you need more information, please let me know.

I checked also the request details. There are a lot of lines like this - Handlers Precondition not match. Not sure if this has an impact.

Also, I saw, AccessPerms 513 in the logs.

Please gently nudge me in the right direction to fix this one.

Thanks.