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hello every one i have installed Fiddler on my win 10 1809 PC .. although i have installed the https certificate it still doesn't work !! at the first pic the error is shown and at the second one when i tried to fix it first pic second pic

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Try this :

  • Launch Fiddler
  • Click menu Tools > Options, HTTPS tab, ensure you see "Certificates generated by CertEnroll engine"
  • Click Actions > Reset All Certificates and wait, accepting all prompts. You might want to select "Decrypt HTTPS traffic".
  • Click OK

Source : Reset Fiddler’s HTTPS certificates.


In the post Fiddler causes my Internet access to stop working, an admin answers:

99% of the time, this is caused by running a 3rd-party firewall which is blocking access to Fiddler.

1% of the time, this is caused by plugging a Windows Phone device into your PC over USB. The Windows Phone team steals Fiddler's default port (8888) from it.

harrymc
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It started working normally after i just checked chrome for updates enter image description here