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.

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. Please ask a new question if you need help.

how to remove invalid certificate

  • 1 reply
  • 1 has this problem
  • 2 views
  • Last reply by cor-el

kathaverty2
kathaverty2
more options

hi

when i go on either safari or firefox websites and type in any search (cnn.com for example) I am being told I have an invalid certificate and someone might make it look like I am going to that website but in fact am not. I do not know how to remove this from my MAC. Can you help?

hi when i go on either safari or firefox websites and type in any search (cnn.com for example) I am being told I have an invalid certificate and someone might make it look like I am going to that website but in fact am not. I do not know how to remove this from my MAC. Can you help?

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

You can check if there is more detail available about the issuer of the certificate.

  • click the "Advanced" button show more detail
  • click the blue SEC_ERROR_UNKNOWN_ISSUER message to show the certificate chain
  • click "Copy text to clipboard" and paste the base64 certificate chain text in a reply

If clicking the SEC_ERROR_UNKNOWN_ISSUER text doesn't provide the certificate chain then try these steps to inspect the certificate.

  • open the Server tab in the Certificate Manager
    • Options/Preferences -> Privacy & Security -> Certificates: View Certificates -> Servers: "Add Exception"
  • paste the URL of the website (https://xxx.xxx) in it's Location field.

Let Firefox retrieve the certificate -> "Get Certificate"

  • click the "View" button and inspect the certificate

You can see detail like the issuer of the certificate and intermediate certificates in the Details tab.