wcf trying to set up tracing to debug, not writing

问题:

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

回答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>

回答2:

To write to the log file, make sure that identity running your web application has write access to the log directory.

You can find the identity in the IIS 7 management console. Select the application pool that your web application is using. Click on Advanced Settings... In the properties window, look for the identity field. It may say Network Service. This is the account that needs write permission to your log output folder.

If you already have a log file in this directory, try deleting it and letting the framework create it.

Hope this helps.

回答3:

1. Make sure you have configured both the system.diagnostics and the System.serviceModel/diagnostics sections configured.

2. Make sure you have them configured in the correct App.config/Web.config file. The thing to note is that multiple config files may exist in a project, and the one used depends on the Build Configuration.

Personally I had the very same symptom until I noticed that I put the sections under app.config (in my case, client side tracing), instead of app.DebugLocal.config. The later was used as my build configuration was set to DebugLocal.

回答4:

Probably the issue is due to permission to write in the log directory specified in your config file. If you are'nt sure wich is the user in the context, give write permission to all machine users.

• Right click in log directory
• Click in the "Security" tab
• Click edit
• On "Group Names or Users" section, select "Users MachineName\Users"
• On "Permissions" section grant permission to write

It worked fine for me.