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Fiddler enters port number for Proxy config on address line in Microsoft Edge - Doesn't work until...

I was not able to access any websites when Fiddler was open when using Microsoft Edge.

Fiddler enters http=127.0.0.1:8888;https=127.0.0.1:8888 into MS Edge’s Manual Proxy setup.

What I did to workaround the issue: Removed the :8888 for each http/https address and then entered 8888 for the port number.

  • Guest
  • Mar 9 2017
  • Will not implement
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  • Eric Lawrence commented
    March 09, 2017 18:42

    Fiddler doesn't do that, but it looks like you've found a bug in Microsoft Edge or in Windows 10.

    What build of Windows 10 did you encounter this behavior on?

  • Eric Lawrence commented
    March 09, 2017 18:46

    I can confirm this bug in Windows 10 version 15048; it's a bug in the "Modern" Control Panel's Proxy settings, whereby it doesn't properly parse a WinINET proxy configuration string. Microsoft needs to fix this but it should be harmless if you don't open the Modern Control panel while Fiddler is running.