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When Fiddler is in capture mode all web pages get attached Certificate Error
This occurs also occurs on Fiddler Menu: Tools/Send Feedback
Reset IE options.
Fiddler Version (v18.104.22.168081)
This simply indicates Fiddler's cert isn't trusted. Tools > Fiddler Options > HTTPS > Actions > "Trust Root Certificate", or, in a pinch "Reset all certificates"
Uninstalled Fiddler via ControlPanel and reinstalled Fiddler
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