I am getting "this connection is untrusted" error messages from Firefox for Desktop when I try to log into certain websites, such as Facebook. Why?

I get this error message "this connection is untrusted" after I re-installed Windows Vista and all my programs. This happened before but after reformatting my computer everything was good. Why am I getting this? Could it be a virus of some sort? It happens when I use Windows Internet Explorer as well....

Hi,
Please check the time/date on the PC. The ideal setting would be to '''Automatically synchronize ...''' in Date and Time > Internet Time.

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Cannot access any https sites, clock is OK, get This Connection is Untrusted error message.

All works OK on Chrome and IE, but Firefox just suddenly stopped access to https sites yesterday, e.g. Google, Facebook and Linkedin. Non secure http sites are OK though. "This Connection is Untrusted" is the error message and technical details are www.google.com.tw uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer). I've tried all the Mozilla support suggestions, clock (which was always correct), reset Firefox, etc. No change so far, I hope you can help fix this issue.

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.

While replaying ajax truclient scipt in loadrunner i am getting "this connection is untrust" error in the 40th step. I tried by deleting cert8 file but no use

while replaying ajax truclient script in loadrunner 11.0, getting error "this connection is untrust" page in 40th step. Add this exeception permanently check box is disable when i got the exeception certificate file. i tried with by deleting cert8.db file in loadrunner ajax truclient profile but still same result.
can any one guide me to resolve this issue...

Is that content loaded in an iframe?
You can check that via the right-click context menu to see if there is a "This Frame" item. 
If that is the case then try top open the frame in a new tab or otherwise check the Technical Details of the error message.

This Connection is Untrusted Error

Having trouble with my Mac or Mozilla. I keep getting the "This Connection is Untrusted" on 3/4 of the websites I visit during a session on the internet. I have made sure that I have the Use SSL 3.0 and Use TLS 1.0 Protocols checked.
I might have deleted some security certificates or added some add-ons right before I noticed the error message.
Anyone have any ideas?
Thanks.

check this article ...
[["This Connection is Untrusted" error message appears - What to do]]
... and let us know, if it helped.

Every time I try to log into ANY website that is secured, I get an error message "This connection is untrusted."

The error message is:
This Connection is Untrusted
You have asked Firefox to connect securely to www.facebook.com, but we can't confirm that your connection is secure.
Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified.
What Should I Do?
If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue.
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)
If you understand what's going on, you can tell Firefox to start trusting this site's identification. Even if you trust the site, this error could mean that someone is tampering with your connection.
Don't add an exception unless you know there's a good reason why this site doesn't use trusted identification.
Steps I have take so far:
Verified that system clock is correct
Cleared all cache, history, cookies, etc.; didn't help
Started Firefox in Safe Mode; didn't help
Disabled all Firefox extensions; didn't help
uninstalled and reinstalled Firefox using Control Panel; didn't help
Ran Microsoft Safety Scan for malware; nothing was found
Other information:
This problem exists ONLY in my user profile and ONLY in Firefox. All 5 other users can run Firefox with no problem. I can run IE and Chrome with no problem.
Problem exists in ALL secured (https) sites.
I use Avast and Windows Firewall. Had never heard of ESET or BitDefender before searching these forums.
A lot of the sites don't give me the option to Make an Exception. The two that I tried to make exceptions for, still wouldn't open.
Run Windows 7 64-bit

unfortunately the fiddler2 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 [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] & [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner].
[[Troubleshoot Firefox issues caused by malware]]

I noticed that I get a "This Connection is Untrusted" error in Firefox. I use KIS 2015. I reseted Firefox. Pls advise

I've just installed the latest version of KIS and now I"ve noticed that I get a "This Connection is Untrusted" error in Firefox whenever I try to go to either of those websites. I reseted Firefox. I am unable to open anything through firefox-- my yahoo mail, google accounts, search through google, etc. Any suggestions on how to get firefox to work?

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.

I keep getting "This connection is untrusted" in all sites when i use Firefox 36.0.1 on windows 8 laptop. How can i overcome this.

I keep getting "This connection is untrusted" in all sites when i use Firefox 36.0.1 on windows 8 laptop. How can i overcome this.

hi vijaysampath, first please make sure that the date, time & timezone are set correctly on your system. if this doesn't solve the issue (or it is already set properly), a possible solution depends on different factors:
* what is the '''error code''' shown under ''technical details'' on the error page?
in case the error code equals ''sec_error_unknown_issuer'', please attempt to add an exception on the bottom of the error page in order to inspect the certificate like it is shown on the screenshot attached:
* which '''issuer information''' does the certificate contain?
please report back with those two pieces of information. thank you!

I get "This Connection is Untrusted" and hit the "I understand the risks..." but get no "add exception" option.

When trying to move address books to Yahoo from Gmail I get "This Connection is Untrusted." I click on "I understand the risks..." but get no way to add an exception.

You shouldn't get that error with such common sites.
You may need to install or update the mozilla-nss packages via the software update of your Linux distribution.

Can't skip "This Connection is Untrusted" error page

The SSL certificate for one of the sites I use expired today a couple hours ago, and the devs of that site still haven't had spare time to update it yet. Suppose it's not a big issue, in most (other) browsers you can just review the problem and click on "continue anyway" link or something like that, when you're sure that the certificate was expected to become invalid. So you can visit the page requested with broken certificate in _single_ click. But not in Firefox.
As I remember - some time ago on the Cert Error page there was "I understand the risks" paragraph with the button "Add exception" below. Looks like it got disabled in Firefox 30 as I don't see it there. Okay, I googled around and found out that in about:config page there's a secret option browser.xul.error_pages.expert_bad_cert which was in disabled state by some reason (I personally haven't ever touched it before). Okay, now I'm able to open the ugly "Add exception" window, but when I add exception - nothing happens. Neither temporary not permanent exception option allowes me to view the site. "This Connection is Untrusted", browser says. Period.
After that I've tried to install "Skip cert error" add-on - with no success. Even if I add the site URL to whitelist in add-on options, which "in theory" should bypass ANY security checks for this exactly domain - then I still end up staring at "This Connection is Untrusted" error which simply can't be bypassed by any means.
The sites I've tried to reach are https://lists.openwrt.org and https://forum.openwrt.org. It's interesting though, the certificate is also expired at https://openwrt.org, but that site can be added to exception list and then firefox opens it. However I see completely NO WAY to make firefox open https://lists.openwrt.org or https://forum.openwrt.org.
I've run out of ideas and came here. Hope somebody knows how to workaround this issue.
PS: I wonder why the hell there's no option to bypass the check by some _simple_ means like in other browsers so that I could reach requested site in seconds rather then searching for settings/addons/workarounds for hours. Thank you firefox for such enourmous care for security, you've made me run Internet Explorer again...
Update 1:
It appears that in this case the certificate was registered for domain openwrt.org, but was also used for forum and lists subdomains. Now it is expired, but the expiration issue can be ignored by exception list only for openwrt.org itself. Other subdomains are actually added to exception list, but it doesn't work for them, so that browser is stuck at "untrusted connection" error which can't be ignored or skipped. What a shame.
Update 2:
I was quiet wrong in Update 1: in fact the SSL certificate for openwrt.org was Level 2 certificate with correcly registered subdomains like forum.openwrt.org and lists.openwrt.org. However when the certificate expired, only openwrt.org exception worked and the site was browseable. All the subdomains could be added to exceptions but regardless of that fact firefox refused to open those sites and was stuck on unskippable "untrusted connection" error page.
For now openwrt.org maintainers have already renewed their certificate so the problem can't be observed on those domains anymore. However I believe that the problem in firefox exceptions handling still exists and should be fixed in future firefox releases.

Hi kozaki, this thread is about an older version of Firefox. Could you start a new question?
For what it's worth, I see the "I understand the risk" section of this page in Firefox 33.0.3: https://forum.anomos.info/ -- but I have not added an exception for the top level site, so maybe that's a partial explanation for the difference.
Also, a new release of Firefox is out today which makes some changes for certificate issues.
To start a new Q: https://support.mozilla.org/questions/new/desktop/fix-problems
If the suggested articles are not useful, scroll past them to continue with the form.

I'm getting an error message from Firefox that says, "Something is trying to trick Firefox into accepting an insecure update. Please contact your network provider and seek help."

I'm getting an error message from Firefox that says, "Something is trying to trick Firefox into accepting an insecure update. Please contact your network provider and seek help." Do you know what is going on here--what this problem could be? (I do have the latest Firefox version already installed. I have previously received Firefox error messages that say "Firefox Update Failed." However, I already had the latest Firefox version installed when I received those error messages.)

Apparently this occurs when Firefox has problems with security certificates. There have been a few questions about this. I will try to get advice about this.
Apparently you are using Internet Explorer 9 (From your system details). Do you have Google Updater plugin installed on Firefox ?
(That been implicated in this sort of problem by one poster, and some users with the problem do have Google Updater, but some do not)

I keep getting an error message when I try to log into to ExportPDF through my Adobe Reader. "Network error occurred while attempting to sign in". Can anyone help, please?

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Hi Simon,
I'm sorry to hear that you're having trouble logging in to ExportPDF via Reader. I've checked your account, and all is well there.
For starters, please make sure that you have the most current version of Reader installed by choosing Help > Check for Updates.
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Please let us know how it goes.
Best,
Sara

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Your library should be unaffected by these steps but there is backup and recovery advice elsewhere in the user tip.
tt2

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<Edited by host>

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Yo,
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I am getting "this connection is untrusted" error messages from Firefox for Desktop when I try to log into certain websites, such as Facebook. Why?

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