This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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

getting sec_error_unknown_issuer while opening gmail. What to do?

  • 1 cavab
  • 2 have this problem
  • 9 views
  • Last reply by cor-el

more options

While opening Gmail on firefox, I am not able to open it as I am getting Untrusted Connection with an error message "sec_error_unknown_issuer". There is no option to add exception also. What to do? I am able to open gmail on other websites .

While opening Gmail on firefox, I am not able to open it as I am getting Untrusted Connection with an error message "sec_error_unknown_issuer". There is no option to add exception also. What to do? I am able to open gmail on other websites .

All Replies (1)

more options

Open this chrome URI by pasting or typing this URI in the location/address bar to open the "Add Security Exception" window and check the certificate:

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

In the location field type/paste the URL of the website

  • retrieve the certificate via the "Get certificate" button
  • inspect the certificate via the "View..." button to see the issuer