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I don't know very much about certificates, and I don't want to break anything trying to resolve this - so asking for some suggestions. At some point agreed to let Fiddler install an HTTPS certificate for decrypting traffic. I decided today that I'm getting spammed somewhat when I have Fiddler opened so I decided to find a way to remove this certificate.

I came across https://stackoverflow.com/questions/16827901/how-do-you-remove-the-root-ca-certificate-that-fiddler-installs and followed step 1 from the accepted answer. I actually don't quite understand step 2 - in that I'm not sure which certificates to delete.

I've restarted my machine since as per another answer, and what I'm finding is now chrome isn't happy visiting a particular internal site. This site has some certificate issues but I was previously able to bypass this (as are other users). But now I'm stuck visiting it without re-installing the Fiddler certificate.

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Can anyone suggest how I am able to fix this?

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The reason of this behavior is explained in Chrome's error message: that website uses HSTS. HSTS enforces more strict certificate policy for the website.

To make Chrome forget HSTS information for this site: [source]

  1. In the address bar, type chrome://net-internals/#hsts
  2. Type the domain name in the text field below Delete domain
  3. Click the Delete button.
  4. Type the domain name in the text field below Query domain
  5. Click the Query button.
  6. Your response should be Not found
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