IIS Express Windows Authentication

I’m trying to use IIS Express with VS2010 to host a silverlight application. I modified my applicationhost.config file to allow for modification of the proper configuration settings. I have the following in my web.config:

<location path="">
  <system.webServer>
    <security>
      <authentication>
        <anonymousAuthentication enabled="false" />
        <windowsAuthentication enabled="true" />
      </authentication>
    </security>
  </system.webServer>
</location>

I am not being authenticated and my domain service call returns a null record as the user. I was able to get this to work after installing VS2010 SP1 BETA but I’m trying to get this to work with only IIS Express.

How do I enable Windows Authentication to work with IIS Express. Is there a configuration setting that I am missing?

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