Error message when you visit a Web site that is hosted on IIS 7.0: "HTTP Error 403.8 - Forbidden"

When you visit a Web site that is hosted on Internet Information Services (IIS) 7.0, you receive an error message that resembles the following:

This issue occurs because the Web site is configured to explicitly deny requests from the client computer. IIS explicitly denies the requests by checking the DNS name of the client computer.

To resolve this issue, follow these steps:

1. In a text editor, open the ApplicationHost.config file.
   
   The ApplicationHost.config file is in the following folder:
   %SystemRoot%\system32\inetsrv\config
2. Locate the ipSecurity XML element.
3. Under the ipSecurity XML element, set the value of the allowed property of the domainName XML element for the client computer to true:
   <add domainName="Client_Computer" allowed="true" />