One more step to enable WCF diagnostics in Logger, and add HttpReplyChannel log.

mcs/class/System.ServiceModel/System.ServiceModel.Channels.Http/HttpReplyChannel.cs

@@ -176,6 +176,8 @@ namespace System.ServiceModel.Channels.Http
 			msg.Properties.Add ("Via", LocalAddress.Uri);
 			msg.Properties.Add (HttpRequestMessageProperty.Name, CreateRequestProperty (ctxi));
 
+			Logger.LogMessage (MessageLogSourceKind.TransportReceive, ref msg, 0x10000); // FIXME: pass maxMessageSize.
+
 			context = new HttpRequestContext (this, ctxi, msg);
 			reqctx = context;
 			return true;

mcs/class/System.ServiceModel/System.ServiceModel/Logger.cs

@@ -69,6 +69,11 @@ namespace System.ServiceModel
 #if !NET_2_1
 		static readonly TraceSource source = new TraceSource ("System.ServiceModel");
 		static readonly TraceSource message_source = new TraceSource ("System.ServiceModel.MessageLogging");
+
+		static Logger ()
+		{
+			message_source.Switch.Level = SourceLevels.Information;
+		}
 #endif
 
 		#region logger methods