Role Manager not working in ASP.Net

Hi
I am in the middle of writing a prototype for an application where I shall be using AZMAN where I have assigned users to roles and have saved the details to an XML file. In my web.config file I have declared a connection string pointing to the XML file, and then declared which role can see which page in my site map.
Unfortunately, unless I am doing something completing wrong, it is not working. The error message I am getting is http 402.1. On checking IIS, I noticed that on .Net Users, IIS was not seeing user names. Therefore, I am looking to see if someone can explain to me how I can get Role Manager to work.
I am using IIS 7 with IE 7 in Vista using ASP.Net 3.5.
 
Thanks 

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