Hi Rich,

Please see "This Connection is Untrusted" error message appears - What to do for more information about the problem. By the way, may i know the website you are visiting when this problem occur? and is this problem happens on multiple website or in a particular website only?

Thank you.

Hello Adriel, thank you for the reply. Sorry for the delayed response.

We manage dozens of juniper Firewalls, we primarily use Firefox as it handles the JAVA much better than other browsers. So this happens with all the Junipers we manage. Also, any site the certificate is challenged. What is happening is, “This Connection is Untrusted” click “I Understand the Risks, click “Add Exception”, nothing happens. Never opens the “Add Security Exception” window to confirm. I have been running FF on this system for a year without issue. Now it is not working at all for me. My Laptop running 31.5.0 of FF no issues there.

Check the date and time and time zone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.

Check out why the site is untrusted and click "Technical Details" to expand this section. If the certificate is not trusted because no issuer chain was provided (sec_error_unknown_issuer) then see if you can install this intermediate certificate from another source.

You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.

• Click the link at the bottom of the error page: "I Understand the Risks"

Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate".

• Click the "View..." button and inspect the certificate and check who is the issuer of the certificate.

You can see more Details like intermediate certificates that are used in the Details pane.

If "I Understand the Risks" is missing then this page may be opened in an (i)frame and in that case try the right-click context menu and use "This Frame: Open Frame in New Tab".

• Note that some firewalls monitor (secure) connections and that programs like Sendori or FiddlerRoot can intercept connections and send their own certificate instead of the website's certificate.
• Note that it is not recommended to add a permanent exception in cases like this, so only use it to inspect the certificate.

Date and Time are correct.

>Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate". • Click the "View..." button and inspect the certificate and check who is the issuer of the certificate. <

Can't do this.  The "Add Security Exception" window never comes up!  So not possible to click "Get Certificate".

Is there an option under about:config to turn this popup back on? That is probably the real issue here is that I can never complete the added exception?

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