http://stackoverflow.com/questions/4209999/an-asp-net-setting-has-been-detected-that-does-not-apply-in-integrated-managed-p | An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode

<configuration>
    <system.webServer>
        <validation validateIntegratedModeConfiguration="false"/>
    </system.webServer>
</configuration>