WCF web service error: The service cannot be activated because it does not support ASP.NET compatibility

On your main service you could mark your service as:

[AspNetCompatibilityRequirements(        RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]

From http://forums.silverlight.net/t/21944.aspx

it will work :

you have change this lines in code or add the line in web.config:

<system.serviceModel><serviceHostingEnvironment aspNetCompatibilityEnabled="false" multipleSiteBindingsEnabled="true" /> </system.serviceModel>

If someone has a lot of services and services are created using custom ServiceHostFactory, then AspNetCompatibilityRequirementsAttribute can also be set in CreateServiceHost method.

Example:

public class HostFactory : ServiceHostFactory{    protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)    {        var host = new ServiceHost(serviceType, baseAddresses);        //other relevent code to configure host's end point etc        if (host.Description.Behaviors.Contains(typeof(AspNetCompatibilityRequirementsAttribute)))        {            var compatibilityRequirementsAttribute = host.Description.Behaviors[typeof(AspNetCompatibilityRequirementsAttribute)] as AspNetCompatibilityRequirementsAttribute;            compatibilityRequirementsAttribute.RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed;        }        else        {            host.Description.Behaviors.Add(new AspNetCompatibilityRequirementsAttribute() { RequirementsMode =AspNetCompatibilityRequirementsMode.Allowed});        }        return host;    }}