I've called the big guys to help you. Good luck.

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

http://www.ehow.com/how_11385212_troubleshoot-reset-connection-firefox.html

https://support.mozilla.org/en-US/kb/server-not-found-connection-problem

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

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

This Connection is Untrusted is sometimes caused because the computer system clock is wrong. Check the time / date / time zone settings.

Hello Lthomas2, check if the issue persist in a new profile.

https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

thank you

ideato said

Hello Lthomas2, check if the issue persist in a new profile. https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile thank you

Hi ideato, This did not work. I am getting (error code: sec_error_unknown_issuer) when I try to use www.mozilla.org

FredMcD said

I've called the big guys to help you. Good luck.

---

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

http://www.ehow.com/how_11385212_troubleshoot-reset-connection-firefox.html

https://support.mozilla.org/en-US/kb/server-not-found-connection-problem

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

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

This Connection is Untrusted is sometimes caused because the computer system clock is wrong. Check the time / date / time zone settings.

Link 1; Tried resetting connection but it did not do anything Link 2; I selected no proxy, changed DNS, changed IPv6, but still not working link 3; does not apply because I can use internet explorer Link 4, 5 and 6; I have already tried these, deleting cert8.db does not do anything

The computer system clock is correct. It says 1/06/2016. Under the "internet time" tab it states "The clock was successfully synchronized with time.windows.com on 1/06/16 at 3.05 PM"

If you can't inspect the certificate via "I Understand the Risks" then try this:

Open the "Add Security Exception" window by pasting this chrome URL in the Firefox location/address bar and check the certificate:

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

In the location field of this window type or paste the URL of the website.

• retrieve the certificate via the "Get certificate" button
• click the "View..." button to inspect the certificate in the Certificate Viewer

You can inspect details like the issuer and the certificate chain in the Details tab of the Certificate Viewer. Check who is the issuer of the certificate. If necessary then you can attach a screenshot that shows the certificate viewer.

cor-el said

If you can't inspect the certificate via "I Understand the Risks" then try this: Open the "Add Security Exception" window by pasting this chrome URL in the Firefox location/address bar and check the certificate:

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

In the location field of this window type or paste the URL of the website.

• retrieve the certificate via the "Get certificate" button
• click the "View..." button to inspect the certificate in the Certificate Viewer

You can inspect details like the issuer and the certificate chain in the Details tab of the Certificate Viewer. Check who is the issuer of the certificate. If necessary then you can attach a screenshot that shows the certificate viewer.

Hi again, tried this for www.hotmail.com since this is one of the website I try to access and not getting into. I attached a screenshot of the certificate.

hello, please download and install firefox 43.0.4 from https://www.mozilla.org/firefox/all/ which should fix the issue for the moment. this will be caused by some software on your device which is intercepting secure network traffic - for more details on that please refer to https://blog.mozilla.org/security/2016/01/06/man-in-the-middle-interfering-with-increased-security/

Just an update. Apparently I had a virus on my computer which was not detected. Getting rid of it solved the problem. Thanks for all the help.

That was very good work. Well Done. Please flag your last post as Solved Problem so others will know.