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email this FAQ to a colleague

Q: I am having problems when I have both NT Challenge/Response and Basic authenication configured for authenication. What am I doing wrong?

A: This is something I ran into while building an intranet website on an NT 4 machine with IIS 3. When you enable both CHallenge response and Basic authentication, when your website is behind a (probably not correctly configured) firewall, Internet explorer users won't be able to access secured web pages. For some reason the firewall won't allow NT to verify the password with Challenge/Response, so IE thinks the connection was refused (and is to stupid to try basic authentication). Netscape browsers will get through though.

- Randy Gerritse

Articles
Feb 3, 2005 - ASP.NET Mixed Mode Authentication
In many web applications it is desirable for both intranet users and external parties to be able to seamlessly log onto the system. The problem this raises is that it is not easy to allow intranet users to log in via Windows integrated authentication while also allowing external parties to log in to the same application using standard forms authentication. This article will show you one way to achieve the best of both worlds when it comes to authentication.
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Code Samples
Authenticate in ASP without NT
Checking NT Group for User Permissions

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IIS Execution File Text Can Be Viewed in Client
Q164059 - 1997.06.23


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