I'm trying to access all sites gives the warning (error code: sec_error_unknown_issuer)

This affects my computer only profile (windows 8) and only on Firefox. I disabled SSL on AVG as help pages suggest and tried to reinstall, both without effect. Someone knows how to fix this?

Check the date and time and time zone in clock of your computer: (double) click on the clock icon in the Windows taskbar.

Find out why the site is not approved, then click on "Technical Details" to expand this section.
If the certificate is not reliable because no issuer channel was provided (sec_error_unknown_issuer) and then see if you can install the intermediate certificate from another source.

You can retrieve the certificate and check details such as WHO issued the certificates and the expiration dates of certificates.

  • Click on the link at the bottom of the error page: "I understand the risks".

Let Firefox recover the certificate: "Add Exception"-> "get certificate".

  • Click on the "view..." button. "and inspect the certificate and the Coachman, who is the issuer of the certificate.

You can see more details like the intermediate certificates that are used in the details pane.

If "I understand the risks" is missing, then this page can be opened in a (i) frame and in this case, try the shortcut menu and use "Frame this: Open image in New Tab".

  • Note that some firewall monitors connections (sure) and that programs like Sendori or FiddlerRoot can intercept connections and send their own certificate instead of the certificate of the Web site.
  • Note that it is not recommended to add a permanent exception in such a case, so only use it to inspect the certificate.

Tags: Firefox

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