Enabling Windows Authentication in IIS Express

If you need to enable Windows Authentication for your ASP.NET Application and you are using IIS Express (usually when you are using the built-in web server with Visual Studio), then you can edit the applicationhost.config file.

The applicationhost.config file is located in the My Documents\IISExpress\config directory (ex: C:\Users\MyUserName\Documents\IISExpress\config\applicationhost.config)

You can simply locate the location element in your applicationhost.config file representing your ASP.NET Web Application so that the section looks like the following:

<location path="ASPNET.MyWebApp">

       <system.webServer>

           <security>

               <authentication>

                   <windowsAuthentication enabled="true" />

               </authentication>

           </security>

       </system.webServer>

   </location>

That is all there is to it!!