Configure ASP.NET for Delegation

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Open a Web.config file in a text editor such as Notepad. The Web.config file is located in the Web Application folder.In the Web.config file, locate the following information in the <configuration> section:
<allow users="*" />
<deny users="?" />
Under the <System.web> section, verify that the authentication element is set to Windows as follows
<authentication mode="Windows" />
Under the <System.web> section, add the following element for impersonation:
<identity impersonate="true" />
For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
306158 (http://support.microsoft.com/kb/306158/) How to implement impersonation in an ASP.NET application
317012 (http://support.microsoft.com/kb/317012/) Process and request identity in ASP.NET
315736 (http://support.microsoft.com/kb/315736/) How to secure an ASP.NET application by using Windows security