http error 404 - no webpage was found for the web address .

Newer OS versions support http profile on Fast Layer 4 virtual server types. There is much complex way it works but worth trying. It may/may not give an error. When you define the pool, which port is selected ? If you dig into error 404, you would get to know that the services are not available,so need to be sure that the service is available, by trying to access the same on individual server