When deploying Silverlight application, you will need to unzip the xap file, modify ServiceReferences.ClientConfig, and zip back the xap file. While there are other options such as modifying the ServiceReferences.ClientConfig before the last build or using code to bypass the ServiceReferences.ClientConfig...

In client configuration, it is required to specify an absolute address of endpoint. However, in IIS-hosted service configuration, it is required to specify a relative address. IIS manages the ServiceHost instance, which provides base address for service. For example, given a service URL http://www.stanleygu...