wcf trying to set up tracing to debug, not writing to log file

Question

here's my web.config, running a WCF service in an application on IIS7, but nothing is being written to the specified file. permission on the file has been granted for everyone.

<system.diagnostics>
  <sources>
   <source name="System.ServiceModel" switchValue="Information, ActivityTracing,     error, warning, critical" propagateActivity="true">
    <listeners>
     <add name="traceListener"
  type="System.Diagnostics.TextWriterTraceListener"
  initializeData="c:\log\tracestext.log" />

    </listeners>
  </source>
  </sources>
 </system.diagnostics>

I can add a service reference just fine.
I then try to call the service from a windows app and, after a few minutes, get an error on the machine running the windows app "Client is unable to finish the security negotiation within the configured timeout (00:00:00). The current negotiation leg is 1 (00:00:00)."

but absolutely nothing is written to the trace log file specified in config.

Is there something else I need to do to enable tracing? thanks for your help

EDIT: "sources" section now matches the section recommended here: http://msdn.microsoft.com/en-us/library/aa702726.aspx

I've added the "diagnostics . messagelogging" section to "system.servicemodel"

and the event viewer shows: "Message Logging has been turned on. Sensitive information may be logged in the clear, even if it was encrypted on the wire: for example, message bodies. Process Name: w3wp Process ID: 1784 "

but the log file is still empty

Answer 1

Yes - you've only just defined some .NET tracing source and listeners - but you haven't instructed WCF yet to actually do the tracing!

You also need:

<system.serviceModel>
    <diagnostics>
        <messageLogging 
            logMessagesAtTransportLevel="true" logMessagesAtServiceLevel="false"
            logMalformedMessages="true" logEntireMessage="true"
            maxSizeOfMessageToLog="65535000" maxMessagesToLog="500" />
    </diagnostics>
</system.serviceModel>

These two sections of config combined should do it!

In order to get your messages written back to the log file right away, you might want to add a setting to your <system.diagnostics> section:

<system.diagnostics>
    ... everything you already have....

    <trace autoflush="true" />
</system.diagnostics>