To many times I’ve searched for this in google. How to trace the WCF messages to disk. Here is how:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <system.diagnostics>
    <sources>
      <source         name="System.ServiceModel.MessageLogging">
        <listeners>
          <add        name="messages"
                      type="System.Diagnostics.XmlWriterTraceListener"
                      initializeData="c:\admin.svclog" />
        </listeners>
      </source>
    </sources>
  </system.diagnostics>

  <system.serviceModel>
    <diagnostics>
      <messageLogging  logEntireMessage="true" 
                       logMalformedMessages="true" 
                       logMessagesAtServiceLevel="true" 
                       logMessagesAtTransportLevel="true" />
      <endToEndTracing propagateActivity="true" 
                       activityTracing="true" 
                       messageFlowTracing="true" />
    </diagnostics>
  </system.serviceModel>
</configuration>