Debugging Windows Phone 7 device traffic with Fiddler

I followed all the steps from the article开发者_高级运维 but when I try to hit the server from my windows phone it says there is a dns error.

Article for reference. http://blogs.msdn.com/b/fiddler/archive/2011/01/09/debugging-windows-phone-7-device-traffic-with-fiddler.aspx

How do I know my windows phone is using my local LAN WIFI as opposed to ATT cellular?

Personally, I use Netmon 2.3 for network traffic information from WP7. Fiddler didn't support WP7 up until recently and Netmon/Wireshark did, so I just stick with those.

Using Netmon 2.3, while your device is connected to Zune/WPConnect, you'd be able to see all WP7 device transport on the ZuneComm process. Netmon isn't as user-friendly as Fiddler, but it's fairly darn specific and easy.

You could turn on flight mode and then turn wifi back on.
Or you could take the sim out.

Either of those ways will ensure you're not using the cellular network.

I used the IP address instead of dns and it worked.