You can use Microsoft Service Trace Viewer (SvcTraceViewer.exe) to help diagnose problems with connections to your WCF services.

For example, if calling WCF service from the client using AJAX (or maybe AJAJ for JSON!) you might get a 500 Server Error, you set a breakpoint in you service but that is never hit, using SvcTraceViewer.exe you can attempt to get some more info.

Add the following to your app\web.config:

 <system.diagnostics>
  <sources>
    <source name="System.ServiceModel" switchValue="Verbose,ActivityTracing"
      propagateActivity="true">
      <listeners>
        <add type="System.Diagnostics.DefaultTraceListener" name="Default">
          <filter type="" />
        </add>
        <add name="ServiceModelTraceListener">
          <filter type="" />
        </add>
      </listeners>
    </source>
    <source name="System.ServiceModel.MessageLogging" switchValue="Verbose,ActivityTracing">
      <listeners>
        <add type="System.Diagnostics.DefaultTraceListener" name="Default">
          <filter type="" />
        </add>
        <add name="ServiceModelMessageLoggingListener">
          <filter type="" />
        </add>
      </listeners>
    </source>
  </sources>
  <sharedListeners>
    <add initializeData="MyWCFTraceLog.svclog"
      type="System.Diagnostics.XmlWriterTraceListener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
      name="ServiceModelTraceListener" traceOutputOptions="Timestamp">
      <filter type="" />
    </add>
    <add initializeData="MyWCFTraceLog.svclog"
      type="System.Diagnostics.XmlWriterTraceListener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
      name="ServiceModelMessageLoggingListener" traceOutputOptions="Timestamp">
      <filter type="" />
    </add>
  </sharedListeners>
  <trace autoflush="true" />
</system.diagnostics>

You can then launch SvcTraceViewer.exe from the Visual Studio command prompt, File-->Open and choose the log file (MyWCFTraceLog.svclog in the above config). You can supply a full path to the log file, e.g.:

 <add initializeData="c:\temp\MyWCFLogFiles\MyFooApp\MyWCFTraceLog.svclog"

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 I'm working on a Silverlight media player like you get on MySpace and other sites. The app is meant to be as simple as possible, so i've created a Silverlight-enabled WCF service which returns a list of the MP3s available in the songs directory on the server. To allow the SL app to be as loosely coupled to the location of the physical mp3s, the wcf service needs to return a list of fully qualified URIs to each mp3 in the directory. When the user selects a song to listen to we can simply set the MediaElement.Source to the URI.

 The following post contains some great code (that can even be used outside of a WebForm) to convert  "~/myfolder/mysubfolder" to http://foo.bar/myfolder/mysubfolder".

http://stackoverflow.com/questions/121962/determine-sites-absolute-fully-qualified-url-in-asp-net

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