How to use Fiddler to monitor WCF service

You need to add this in your web.config

<system.net>
  <defaultProxy>
    <proxy bypassonlocal="False" usesystemdefault="True" proxyaddress="http://127.0.0.1:8888" />
  </defaultProxy>
</system.net>
  1. then Start Fiddler on the WEBSERVER machine.
  2. Click Tools | Fiddler Options => Connections => adjust the port as 8888.(allow remote if you need that)
  3. Ok, then from file menu, capture the traffic.

That’s all, but don’t forget to remove the web.config lines after closing the fiddler, because if you don’t it will make an error.

Reference : http://fiddler2.com/documentation/Configure-Fiddler/Tasks/UseFiddlerAsReverseProxy

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