Can't access local URI

I've created the duplex (polling) service outlined here http://msdn.microsoft.com/en-us/library/cc645027(VS.95).aspx and the client outlined here http://msdn.microsoft.com/en-us/library/cc645028(VS.95).aspx.   I get an exception in the client's Page.xaml.cs file when calling the service.  The exception occurs in the method below.

The exception occurs here

channel.EndSend(result);

It reads

e = {System.ServiceModel.CommunicationException: An error occurred while trying to make a request to URI 'http://localhost:56103/Service1.svc'. This could be due to a cross domain configuration error. Please see the inner exception for more details. ---> System...


InnerException = {System.Security.SecurityException ---> System.Security.SecurityException: Security error.
   at MS.Internal.InternalWebRequest.Send()
   at System.Net.BrowserHttpWebRequest.BeginGetResponseImplementation()
   at System.Net.BrowserHttpWebRequest.Internal...

Is there something related to Silverlight's security that I need to configure for this to work?
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void CompleteOnSend(IAsyncResult result)
        {
            try
            {
                IDuplexSessionChannel channel = (IDuplexSessionChannel)result.AsyncState;
 
                channel.EndSend(result);
 
                // The message is now sent. Notify the user.
 
                uiThread.Post(WriteText, "Client says: Sent order of " + order + Environment.NewLine);
                uiThread.Post(WriteText, "Service will call back with updates" + Environment.NewLine);
            }
            catch (Exception e)
            {
            }
 
        }