<system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
    </modules>
  </system.webServer>

OR

<system.webServer>
    <!--<modules runAllManagedModulesForAllRequests="true">
    </modules>-->
    <handlers>
      <add name="UrlRoutingHandler" type="System.Web.Routing.UrlRoutingHandler, System.Web" path="/promo/*" verb="*" />
    </handlers>
  </system.webServer>