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This connection is not secure error (sec_error_unknown_issuer) on every HTTPS page

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  • 1 имеет эту проблему
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  • Последний ответ от cor-el

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I get the "this connection is not secure" error on every page. Happened after Firefox offered to "refreshed" itself because I haven't used it in a while. The refreshing process seemed to reset the browser settings and removed old addons which was fine but it also caused the insecure connection errors to come up on every site. Even Google search doesnt work now.

This wasn't really a warm welcome, given that I also cant watch streaming videos on Twitch with Firefox, this browser is absolutely in a useless state for me. I don't want to invest any time in fixing this since there are other browsers out there which work fine out of the box, but I did want to make you aware of the existance of these issues.

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You can check the date and time and time zone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.

You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.

  • Click the link at the bottom of the error page: "I Understand the Risks"
  • Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate"
  • Click the "View" button and inspect the certificate
    Check who is the issuer of the certificate

You can see details like intermediate certificates that are used in the Detail tab.

Who is the issuer of the certificate?

There is security software like Avast and Kaspersky that intercept secure connections and send their own certificate.

If you have Avast then try to disable HTTPS scanning in Avast Web Shield.


If you can't inspect the certificate via "I Understand the Risks" then try this:

Open the "Add Security Exception" window by pasting this chrome URL in the Firefox location/address bar and check the certificate:

  • chrome://pippki/content/exceptionDialog.xul

In the location field of this window type or paste the URL of the website.

  • retrieve the certificate via the "Get certificate" button
  • click the "View..." button to inspect the certificate in the Certificate Viewer

You can inspect details like the issuer and the certificate chain in the Details tab of the Certificate Viewer. Check who is the issuer of the certificate. If necessary then you can attach a screenshot that shows the certificate viewer.