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

Wannan tattunawa ta zama daɗaɗɗiya. Yi sabuwar tambaya idan ka na bukatar taimako.

Firefox keeps giving error message: This Connection is Untrusted.

  • 5 amsoshi
  • 26 sa na da wannan matsala
  • 4 views
  • Amsa ta ƙarshe daga philipp

Fishingbrian
Fishingbrian
more options

I downloaded 7zip file compressor yesterday and afterward when I would try and open websites on Firefox I would get "This connection is untrusted" with most every website. The

www.facebook.com uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)

The time on my computer is in sync. The "allow this certificate option" does not allow the certificate.

The big thing is that I lost all of my bookmarks. The last time they were saved to my computer was a year ago.

I downloaded 7zip file compressor yesterday and afterward when I would try and open websites on Firefox I would get "This connection is untrusted" with most every website. The www.facebook.com uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer) The time on my computer is in sync. The "allow this certificate option" does not allow the certificate. The big thing is that I lost all of my bookmarks. The last time they were saved to my computer was a year ago.

All Replies (5)

kubahaha
kubahaha
more options

Most probably it wasn't only 7zip, but also some virus included. Can you provide URL to site from which you have downloaded 7zip?

Fishingbrian
Fishingbrian Mai mallakar tambaya
more options

Thank you kubahaha, I am pretty sure it was http://galleryhip.com/thoracic-outlet-syndrome-exercises.html

I have run Spybot and Malware and I had a "high alert" show up and fixed. But I think you are right. It looks like there may be something running in the background. I would be happy if I could just recover my bookmarks.

philipp
philipp
  • Moderator
more options

hello, 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

Fishingbrian
Fishingbrian Mai mallakar tambaya
more options

Thank ou Philipp 

     CN: DO_NOT_TRUST_FiddlerRoot
       O: DO_NOT_TRUST
     OU: Created by http://www.fiddler2.com
philipp
philipp
  • Moderator
more options

ok, unfortunately the fiddler2.com issuer in certificates might be a sign of unwanted software present on your pc that is intercepting secure network traffic. please go into the system control panel and uninstall programs like BrowserSafeguard, BrowserSafe, SafeGuard or other software that sounds suspicious and didn't get installed by you intentionally.
reference: https://support.mozilla.org/en-US/questions/982532#answer-520145

afterwards, run a full scan of your system with different security tools like the free version of malwarebytes & adwcleaner.

Troubleshoot Firefox issues caused by malware

afterwards you could try to get back your bookmarks this way: press ctrl+shift+b and go to import & backup > restore and see if there's a restore point present from within the last days before the unwanted change happened...