Important Notice: We're experiencing email notification issues. If you've posted a question in the community forums recently, please check your profile manually for responses while we're working to fix this.

On Monday the 3rd of March, around 5pm UTC (9am PT) users may experience a brief period of downtime while one of our underlying services is under maintenance.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. اگر به کمک نیاز دارید لطفاً یک سؤال بپرسید.

Updated Firefox Now Insecure Connection for every website

  • 1 پاسخ
  • 7 have this problem
  • 2 views
  • آخرین پاسخ توسّط FredMcD

icomputeuk
icomputeuk
more options

Just updated to Firefox 58.0.1 for Mac running El Capitan 10.11.6 and every single HTTPs website is blocked with SEC_ERROR_UNKNOWN_ISSUER insecure connection.

Have refreshed Firefox. Disabled all extensions and addons and (being a Mac) have no security software that could potentially mess with it.

It was literally working just minutes ago with the previous version of Firefox and there assume it must be an issue with the update.

Please help. I'm having to use Safari which I hate!

Just updated to Firefox 58.0.1 for Mac running El Capitan 10.11.6 and every single HTTPs website is blocked with SEC_ERROR_UNKNOWN_ISSUER insecure connection. Have refreshed Firefox. Disabled all extensions and addons and (being a Mac) have no security software that could potentially mess with it. It was literally working just minutes ago with the previous version of Firefox and there assume it must be an issue with the update. Please help. I'm having to use Safari which I hate!

All Replies (1)

FredMcD
FredMcD
more options

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

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites

https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message

https://support.mozilla.org/en-US/kb/connection-untrusted-error-message

http://kb.mozillazine.org/Error_loading_websites


  • uses an invalid security certificate SSL_ERROR_BAD_CERT_DOMAIN
  • configured their website improperly

How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER