Well 127.0.0.1 is a shortcut for localhost and works fine if you run FiddlerCore on the same machine which traffic you want to monitor. Of course you can run FiddlerCore on a different machine and then you have to manually set the IP address of that different machine as the address of your proxy.
So all you have to do is run FiddlerCore on a machine which IP address is 127.0.0.2. That might prove really hard to do, however. Wouldn't running FiddlerCore on a different port get the job done for you?
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