This module, when loaded through the web.config file (<authentication mode="Passport">), provides authentication using Microsoft's Passport service. In this model, the ASP.NET framework will check for the Passport "ticket" (an encrypted value in a cookie or the query string) and use it to authenticate the user. If no ticket is present, or if it has expired, the user will be redirected to the Passport service's login page. The user will be redirected automatically to the original ASP.NET page with the correct ticket after logging in. At this point, the Authenticate event will be fired. You can handle this event with an event handler named PassportAuthentication_OnAuthenticate in the global.asax file.

The location of the Passport login page is set using the <passport redirectUrl> element in the web.config file.

public sealed class PassportAuthenticationModule : System.Web.IHttpModule {
// Public Constructors
   public PassportAuthenticationModule( );
// Public Instance Methods
   public void Dispose( );                           // implements System.Web.IHttpModule
   public void Init(System.Web.HttpApplication app); // implements System.Web.IHttpModule
// Events
   public event PassportAuthenticationEventHandler Authenticate;
}