Consider providing automated support for network-isolated applications like metro-style applications. The feature is available in Fiddler Classic through the WinConfig option

Details on how an application can be exempted from the Windows settings are posted here:

https://learn.microsoft.com/en-us/previous-versions/windows/apps/dn640582(v=win.10)?redirectedfrom=MSDN 

https://stackoverflow.com/a/33263253