Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

ابحث في الدعم

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.

Firefox error "sec_error_unknown_issuer"

  • 2 (ردّان اثنان)
  • 31 have this problem
  • 23 views
  • آخر ردّ كتبه ann-mari

CarlesV
CarlesV
more options

After years and years of using Firefox, I decided to leave it and start using Google Chrome. Why ? Because Firefox returns error "sec_error_unknown_issuer" very often, when I access to my usual websites. Something must have been wrong with last Firefox update. Getting these SSL errors on every other site is starting to really get annoying! There is nothing wrong with the SSL certificates or the sites. It's your browser that is unable to verify the certificates.

When you fix it, maybe (only maybe) shall I return to Firefox.

Have a good day.

After years and years of using Firefox, I decided to leave it and start using Google Chrome. Why ? Because Firefox returns error "sec_error_unknown_issuer" very often, when I access to my usual websites. Something must have been wrong with last Firefox update. Getting these SSL errors on every other site is starting to really get annoying! There is nothing wrong with the SSL certificates or the sites. It's your browser that is unable to verify the certificates. When you fix it, maybe (only maybe) shall I return to Firefox. Have a good day.

All Replies (2)

philipp
philipp
  • Moderator
more options

hello, this is most probably caused by external factors and a possible solution depends on different factors. please attempt to add an exception on the bottom of the error page & inspect the certificate (see the screenshot attached for instructions):
which issuer information does the certificate contain?

thank you!

"This Connection is Untrusted" error message appears - What to do

ann-mari
ann-mari
more options

I did have this problem and I did remove Rocket Tab and the problem was solved!

Did try the removal of cert8.db. first a few times but it didn't work .