WCF 4.5 - Host Unreachabl​e when calling a WCF service from soapUI

The WCF Test Client (WCFTestClient.exe) is Visual Studio's disappointingly basic tool for testing your WCF services. If you have your hopes up that the the Visual Studio 2012 WCF Client tool for .NET 4.5 is any better, forget about it. It is still so simple that it doesn't support client X509 Certificates or even username and passwords. Other tools like Fiddler and Wireshark are also compulsory items on the toolbelt (along with .NET coded integration unit tests). Fiddler supports client certificates out of the box and works a charm (especially for REST services).
I have used soapUI (http://www.soapui.org/) extensively for the past few years for basic integration testing of WCF (with basic endpoint bindings) and SAP web services. I've been using those also to test out connections to my current client's back-end banking systems.

soapUI isn't perfect though - as there are differences in interpretations of the WS-* standards between the Java and the .NET worlds - and soapUI is based on a Java stack. One such problem that you'll find with calling Microsoft WCF services with wsHttpBinding soapUI is that you get the following exception when you use the default settings:

    
      http://www.w3.org/2005/08/addressing/soap/fault
   
    
      
         
            s:Sender
            
               a:DestinationUnreachable
             
         
         
            The message with To '' cannot be processed at the receiver, due to an AddressFilter mismatch at the EndpointDispatcher.  Check that the sender and receiver's EndpointAddresses agree.
          
      
   

This is because there is no "To" entry in the header of the message. The fix for this is to go to the soapUI WS-A tab and ensure that the "add default wsa-To address is checked on" as per the screenshot below: