Capture outgoing ASP.NET traffic from windows 10 with Fiddler

Question

I recently upgraded to windows 10, and have discovered an issue that I was able to do on Windows 8.1, but seem to be unable to do on Windows 10.

In my ASP.NET web application I have a controller that receives a GET request and then issues it's own GET request to another server and then sends that response back.

When debugging I have added the following to the application web.config:

<system.net>
    <defaultProxy>
        <proxy autoDetect="false" bypassonlocal="false" proxyaddress="http://127.0.0.1:8888" usesystemdefault="false" />
    </defaultProxy>
</system.net>

Which in 8.1 was able to capture both the local server request and the remote server request. However, I haven't been able to get Windows 10 to do the same.

I did exempt all in the WinConfig settings on Fiddler.

EricLaw EricLaw · Accepted Answer · 2015-08-15T13:05:22

WinConfig won't affect anything; it only relates to Metro/Immersive apps.

If you update web.config to point to a bogus proxy (e.g. 127.0.0.1:1111) does it fail? If not, then your app isn't using the configured proxy settings.

If updating web.config doesn't work, you might try editing the appropriate (probably 64bit) machine.config.

Capture outgoing ASP.NET traffic from windows 10 with Fiddler

1 Answers