Windows Authentication
ASP.NET still requires Internet Information Server (IIS) to handle Web requests. ASP.NET is layered on top of IIS using an ISAPI filter just like ASP.old. What this means is that ASP.NET participates in the IIS security model.
Before ASP.NET is even called on to execute a page, IIS must be satisfied that the user has permission to request the page. This permission check is done using any of the standard mechanisms built in to IIS, including Basic Authentication, Digest Authentication, or Integrated Windows Authentication.
When the user first requests a page that requires authentication, IIS initially returns an HTTP 1.1 401 Access Denied error to the browser. Included in the response is the WWW-Authenticate header, which ...
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