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This connection is untrusted.
Just installed Firefox and any webpage I try to go to gives me an untrusted error. I'm using Mac OS X El Capitan.
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Here's a screenshot of the error: http://s28.postimg.org/ugxsbsu0t/Untrusted.png The upload thing seems to not have worked when I was creating the question.
There is security software like Avast and Kaspersky and BitDefender and ESET that intercept secure connections and send their own certificate.
This Connection is Untrusted is sometimes caused because the computer system clock is wrong. Check the time / date / time zone settings.
Separate Issue; Your System Details shows;
Adobe Shockwave for Director Netscape plug-in, version 188.8.131.527
Adobe Shockwave for Director Netscape plug-in, version 184.108.40.2069
Having more than one version of a program may cause issues. You must remove the older programs. Then get the current full installer.
I may just be repeating what FredMcD said, but...
When you get this for pretty much all secure sites, the problem usually is one of the following:
(1) Error in your system's date, time, or time zone, which throws off certificate validity checks. Sometimes allowing computers to use an internet-based time source can introduce this problem.
(2) Firefox not being set up to work with your security software that intercepts and filters secure connections. Products with this feature include Avast, BitDefender, ESET, and Kaspersky; AVG has a Search Shield feature which can cause this error on search sites.
(3) Malware on your system intercepting secure connections.
So... which is it?
If you have any of those specific security products, that would be the first thing to check. We might be able to assist with specific next steps based on what you have if you tell us.
To gather further information, you could inspect a sample certificate to see whether that points to the culprit. If you want to try that now, here's how I suggest starting:
Load my test page at: https://jeffersonscher.com/res/jstest.php
You likely will get an error page. Expand the "I understand the risks" section and look for an Add Exception button.
Note: You don't need to complete the process of adding an exception -- I suggest not adding one until we know this isn't a malware issue -- but you can use the dialog to view the information that makes Firefox suspicious.
Click Add Exception, and the certificate exception dialog should open.
Click the View button. If View is not enabled, try the Get Certificate button first.
This should pop up the Certificate Viewer. Look at the "Issued by" section, and on the Details tab, the Certificate Hierarchy. What do you see there? I have attached a screen shot for comparison.