MVC5 App runs on development machine but gives HTTP 404.0 or 403.14 when deployed to http://w.x.y.z/Default Web Site/Application

The MVS application CCCFE07 starts without problems on the development machine
It is deployed to our demo webserver using the Framework 4.5 Web-Deployment feature
server: http://80.90.100.110
site name: Default Web Site/CCCFE07
destination URL: http://80.90.100.110
Validate Connection is ok

RouteConfig is
namespace CCCFE07 {
    public class RouteConfig {
        public static void RegisterRoutes( RouteCollection routes ) {
            routes.IgnoreRoute( "{resource}.axd/{*pathInfo}" );

            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );
        }
    }
}
CCCFE07\Views\Home\Index.cshtml  exists

The Web Deploy feature installs the app on the server to Default Web Site/CCCFE07 and maps Default Web Site/CCCFE07 to the physical path c:\inetpub\wwwroot\CCCFE07 where we can see the subdirectories bin, Content, fonts, Scripts, Views

Trying to start the app on the server with
- localhost/cccfe07 gives error 403.14 Forbidden
- localhost/cccfe07/Home gives error 404.0 not found which seems reasonable since physical path C:\inetpub\wwwroot\CCCFE07\Home\ does not exist
- localhost/cccfe07/Views gives error: Method not found: '!!0[] System.Array.Empty
- localhost/cccfe07/Views/Home gives same error

"Enable Directory Browsing" is probably no option, since the configured start document shall be started
A default document is defined in RouteConfig (see above)

What must be done so that the http://localhost/CCCFE07 app can be startet on the Web Server?

Thanks for your help.

Joachim