Handle WCF exceptions from webservice proxy - web-services

Question

I have a WCF service (.NET 4) hosted in IIS. My service contract has one method with:
[FaultContract(typeof(string))]
My service implementation for that method validates input parameters and may throw an exception like this:
if (string.IsNullOrWhiteSpace(siteName)) { throw new FaultException("siteName is required."); }
The consumer program of this service is a .NET 2 console application. In this app I generated the webservice proxy by right clicking "References" and "Add web reference".
When I try to call the service method from the client app, by sending an invalid siteName, I get back a 503 Service Unavailable exception, instead of a FaultException with the custom error message.
How can I make the FaultException, with the custom error message, propagate to the client program?
UPDATE:
The exception I get in the client application is this:
System.ServiceModel.ServerTooBusyException:
The HTTP service located at
http://www.example.com/services/myservice.svc
is too busy. ---> System.Net.Web
Exception: The remote server returned
an error: (503) Server Unavailable.
at
System.Net.HttpWebRequest.GetResponse()
at
System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpCha
nnelRequest.WaitForReply(TimeSpan
timeout) --- End of inner exception
stack trace ---

Answer 1

The problem was being caused by a custom HTTP module in our web project. So it was not exactly a WCF problem, but a problem specific to our solution. Thanks!