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Authentication tutorials

  • Authentication is the process by which you obtain identification credentials such as the user's name and password and validate those credentials against some authority.

  • An ASP.NET Web application can be provided with one of the following types of security:

  • WindowsAuthintication: The application is secured by using Integrated Windows Authentication. In this method, access to a Web application is allowed only to those users who are able to verify their Windows credentials.Credentials can be verified against the Windows authentication database (SAM) or against Active Directory.

  • Passport Authintication: The application is secured by using Microsoft Passport authentication. Passport is a single-sign-on technology developed by Microsoft for use on the Web. Typically, Passport authentication is used when you need single log on capability across multiple domains.

  • Forms Authintication: ASP.NET includes a built-in feature, called forms-based authentication, which can be used to implement customized logic for authenticating users and authentication handlers without having to worry about session management using cookies. In forms-based authentication, when a user is determined to be unauthenticated, the user is automatically redirected to the login page. Some of the benefits of the forms-basedauthentication are the following:

    1. Developers can configure forms-based authentication for various parts of the Web site differently, because the Web.config file is a hierarchical XML document.

    2. Administrators and developers can change the authentication scheme quickly and easily in the Web.config file.

    3. Administration is centralized because all the authentication entries are in one place the Web.config file.

    4. Set the Authentication mode to "Forms" in the Web.config file. This file should be present in the same directory as the ASP.NET Web application.



<authentication mode="Forms">


<!-- Assign a cookie named B2CBuySiteAuthCookie when user is authenticated. The page used for validating user credentials is userlogin.aspx. Make sure the cookie is encrypted and validated by setting the protection to All, the cookie will timeout after 10 minutes -->


<forms name=".B2CBuySiteAuthCookie" loginUrl= "userlogin.aspx" protection="All" timeout="10" />



<!-- anonymous users will be denied access.

This is needed to force forms-authentication -->

.<deny users="?"/>




None/Default Authintication: Default authentication is used when you do not want any security on your Web application; anonymous access is required for this security provider. Among all authentication providers, Default authentication provides maximum performance for your application. This authentication provider is also used when you use your own custom security.


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