How to use Fiddler to monitor a Windows Service?

Question

It seems that Fiddler will not monitor anything that's not run under the same user as Fiddler itself. I would like to monitor a Windows Service which is run under Local System.

Is this possible?

Answer 1

I made it work by referring Is there a way to configure Fiddler to intercept HTTP calls from a Windows service?

Codeka provided a clue to get me going in the right direction. The piece that was still missing was how to get the proxy configured. The <appname>.exe.config [needs <defaultProxy> specified][1] to have a section like the following added:

<configuration>

   <!-- The `<system.net>` element is an immediate child of >`<configuration>` but can appear anywhere in app.config -->
   <system.net>
       <defaultProxy enabled="true">
           <proxy proxyaddress="http://127.0.0.1:8888" bypassonlocal="False"/>
       </defaultProxy>
   </system.net>

</configuration>

Once this was done the Windows service's http traffic started flowing through Fiddler.