asp.net 4.5 Framework Identity Block anonymous users

I  am trying to set the security for a new site and I  am trying to set the allows in my web.config.  The issue I am having is when I add

    <system.web>
      <authorization>        
        <deny users="?"/>
      </authorization>
    </system.web>

to my web.config I get

HTTP Error 404.15 - Not Found

The request filtering module is configured to deny a request where the query string is too long.