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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.

  • still no internet connection after starting capturing traffic !!!!!!! – mina nageh Oct 21 '18 at 17:02
  • I added another possibility. – harrymc Oct 21 '18 at 17:53
  • can this case the problem ?! image.ibb.co/dn5PWL/image.png – mina nageh Oct 21 '18 at 18:23
  • Not likely : DNS does not use HTTP or HTTPS, so doesn't go through Fiddler. I would advise as a test to disable your firewall and anti-virus to see if one of them is the cause. – harrymc Oct 21 '18 at 18:29
  • no it didn't fix it :( – mina nageh Oct 21 '18 at 18:51
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It started working normally after i just checked chrome for updates enter image description here

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