WCF services don’t run on IIS 8 with the default configuration, because the webserver doesn’t know, how to handle incoming requests targeting .svc files. You can teach it in two steps

• Add a new MIME type:

　　　　Extension: .svc        MIME type: application/octet-stream

•   Add a new Managed HTTP Handler:    

　　　　Request path: *.svc       Type: System.ServiceModel.Activation.HttpHandler       Name: svc-Integrated