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1. Have Winphone developer tools installed. Download it for yourself2. Connect Phone via USB3. Wait till zune starts and sync completes4. Verify that zune is not in a guest relationship5. open a command prompt, type netstat -a to confirm that port 443 is not being used6. open an admin command prompt, navigate to c:\windows\system32\drivers\etc\ then type notepad hosts and delete any references to windowsphone developer services7. go to the settings on the phone and turn airplane mode on so that the phone is forced to use internet via zune8. While the phone is still on the settings page, run Chevron with admin privileges

via CHevron WP7 USB device connections problem FIX! – xda-developers.