Firefox sec_error_unknown_issuer

I have a brand new install of Firefox and am trying to get to a site owned by ANZ bank (one of the largest financial institutions in Australia).
https://uatepr.onepath.com.au/epr/launcher/launcher.aspx
The certificate is issued by "VeriSign Class 3 International Server CA - G3", so why is this certificate not recognised by Firefox?

hello jarvieia, the site you have referenced [http://www.sslshopper.com/ssl-checker.html#hostname=https://uatepr.onepath.com.au doesn't properly implement a certificate chain] that links their certificate issued from a intermediary instance to the root certificate authority trusted by the browser.
you can visit https://www.symantec.com/page.jsp?id=ca-ra once - that should be enough to store this intermediary certificate used by the bank in the certificate store of the browser.

Similar Messages

Firefox error "sec_error_unknown_issuer"

After years and years of using Firefox, I decided to leave it and start using Google Chrome.
Why ?
Because Firefox returns error "sec_error_unknown_issuer" very often, when I access to my usual websites.
Something must have been wrong with last Firefox update.
Getting these SSL errors on every other site is starting to really get annoying! There is nothing wrong with the SSL certificates or the sites. It's your browser that is unable to verify the certificates.
When you fix it, maybe (only maybe) shall I return to Firefox.
Have a good day.

hello, this is most probably caused by external factors and 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]]

Firefox recently began blocking my companies instance of SAP to launch another page. How can I bypass (Error code: sec_error_unknown_issuer)

This Connection is Untrusted
You have asked Firefox to connect securely to xxxx.xx.xxx, 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.
xxxx.xx.xxx uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)

hello ntbinkle, the issue with missing intermediary certificates ideally has to be solved by the server in question by properly implementing a certificate chain, linking the ssl-certificate for the url to the root certificate authority.
as a workaround, you might be able to manually import the missing intermediary certificate - therefore please attempt to add an exception on the bottom of the error page under ''i understand the risks'' & inspect the certificate (see the screenshot attached for instructions):
which '''issuer information''' does the certificate contain?

Firefox is complaining about a no. of secure websites (sec_error_unknown_issuer)...

I've recently re-built the computer. It's Windows 7 Home Premium and is fully upto date (as far as Windows update in concerned). On top of this a fresh installation of FireFox 5 has been installed. Since doing this (compared to pre re-build) FireFox is displaying "Untrusted Connection" errors for a no. of different https:// sites. All of the errors are the same:
xxx.xxx.xxx uses an invalid security certificate.
The certificate is not trusted because no issuer chain was provided.
(Error code: sec_error_unknown_issuer)
The main sites at the moment are mail.spamcop.net & store.playstation.com. Any help would be most appreciated as this is causing us some real headaches.

You can test the certificate chain via a site like this:
*http://www.networking4all.com/en/support/tools/site+check/
That will confirm that both servers do not send the intermediate certificate that is needed. 
Firefox automatically saves intermediate certificates that a sever sends and with a new set up (profile folder) those certificates may not have been saved yet.
You can Copy and Paste the red certificate text on the www.networking4all.com site to a .cer text file and import the certificates in the Certificate Manager.
DON'T set any trust bits, those are only required for root certificates and not for intermediate certificates.
*Tools > Options > Advanced : Encryption: Certificates - View Certificates

Firefox 8 not displaying addons, error code:sec_error_unknown_issuer

I receive the following error message when opening the addons tool bar...
support.mozilla.com uses an invalid security certificate.
The certificate is not trusted because the issuer certificate is unknown.
(Error code: sec_error_unknown_issuer)

Did you check the details of that certificate like the issuer and when it is valid by retrieving the certificate?
* 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.
You can see more Details like intermediate certificates that are used in the Details pane.

On some sites we get sec_error_unknown_issuer SSL error due to missing root certificate TC TrustCenter Class 2 L1 CA XI. Firefox is the only browser having this issue. Why is that certificate not preinstalled and shipped with Firefox?

On some sites we get sec_error_unknown_issuer SSL error due to missing root certificate TC TrustCenter Class 2 L1 CA XI. Firefox is the only browser having this issue. Why is that certificate not preinstalled and shipped with Firefox?
Check sales.sauer-danfoss.com for details with Firefox 7.
Thanks
Stefan

You are not sending the TC TrustCenter Class 2 L1 CA XI intermediate certificate
*http://sales.sauer-danfoss.com/
Web servers need to send all required intermediate certificates to build the chain to build-in root certificates.
You need to install that intermediate certificate on your server.
*http://www.trustcenter.de/en/infocenter/root_certificates.htm#3479
You can test the certificate chain via a site like this:
*http://www.networking4all.com/en/support/tools/site+check/

Facebook, google ERROR sec_error_unknown_issuer in Fresh Firefox 35 windows 8.1

Windows 8.1 64-bit
Firefox 35 (Latest)
- Fresh Installed firefox 35
- Even refreshed Firefox with safe-mode
- when opening page google.com, facebook.com (Attached Image) getting error page that should not be the error/exception.
- This is not for the first time even in past I had got this error for google.
Why firefox developer is neglecting this every time they introduce newer version.?

hello raviparekh027, thanks for providing the screenshots.
as this problem might have different external causes please provide another piece of information:
when you attempt to add an exception on the bottom of the error page (don't do it for real though!) & inspect the certificate, '''which issuer information''' does the certificate contain? (see screenshot)
thank you!

When connecting to Google, Firefox says it's not trusted and returns the error "sec_error_unknown_issuer"

I'm running the latest version of Firefox on Windows 7 Home Premium. I use Kaspersky antivirus.

Kaspersky has a feature to scan your web traffic and when it wants to scan HTTPS connections it needs to intercept and decrypt the traffic, which requires presenting Firefox with a fake certificate.
This support article has the steps for setting up Opera by importing a certificate file generated by Kaspersky, and it's most similar for Firefox:
http://support.kaspersky.com/us/9093#block1
In Firefox, you would import the .cer file using the Advanced Panel of the Options dialog, here:
"3-bar" menu button (or Tools menu) > Options > Advanced > Certificates mini-tab > "View Certificates" button
When the Certificate Manager dialog opens, click the Authorities tab (as you would in Opera).
Can you get the certificate imported and get to Google?

I have 2 computers on a router. For the same website 1 computer works ok. For that same website the other computer comes up with (error code: sec_error_unknown_issuer) Both computers using firefox 3.6.12.

Both computers are using Windows XP SP3 operating systems.

See this [http://www.networking4all.com/en/support/tools/site+check/report/?fqdn=https%3A%2F%2Fsecure.winterthur.org%2Fecommerce%2FitemList.aspx%3Fnode_id%3D55247&protocol=https Site Check report.]
Error while checking the SSL Certificate!! 
Unable to get the local issuer of the certificate. The issuer of a locally looked up certificate could not be found. Normally this indicates that not all intermediate certificates are installed on the server.

I just downloaded the new version of Firefox and now every site I used to use such as Facebook, Twitter, and Youtube show "This Connection Is Untrusted"

I just downloaded the new version of Firefox and now every site I used to use such as Facebook, Twitter, and Youtube show "This Connection Is Untrusted". Even when I do accept the risks the site no longer looks the way it's looked for years. Twitter doesn't even give me the option to accept the risks at all and shows this error (Error code: sec_error_unknown_issuer). I've tried resetting Firefox, I've checked the time and date, and I've removed and added Firefox to see if that would work. Nothing seems to be working so I can see the sites the way they normally would be instead of "coded". Can anybody help me please?!!! Thanks

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

Have been using firefox for years but now having many problems two days ago could not acess any web pages without a firefox message saying page could not be ver

Went on the internet on Friday but a box appeared saying firefox could not verify web page and somebody could be trying to impersinate the web page this was my home page it gave me two options the first was get me out of here or that I understood the risks and to continue I clicked the latter and my home page came up this box continued to appear on each occasion I tried to acess any web pages but when I tried to acess Facebook the box only gave me the option of get me out of here it also did this when I tried to acess Mozilla Firefox to see whether there was a problem with the browser I tried to reinstall the browser but the problem persisted I finally got round the problem by reinstalling my computer to an earlier time before I did this I also have the option for Google chrome on my computer and this browser worked fine Facebook etc I prefere Firefox but although the warning box hasn't materialised since I reset my computer Firefox has become unstable where it has frozen on a web page and the only way I can get out is to start the task manager and end the programme even though the task manager is saying that the page is still working correctly but after I have ended the running of the programme it will not reload the firefox browser but again google chrome is fine I have to restart the computer to fix this problem any ideas thanks.

Can you attach a screenshot?
*http://en.wikipedia.org/wiki/Screenshot
*https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
*Use a compressed image type like PNG or JPG to save the screenshot
*Make sure that you do not exceed the maximum size of 1 MB
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.

Been using Firefox for years, yesterday not able to get Firefox page at all, page comes up blank

I have been using Firefox for years. Somehow I seem to have blocked it. I get a blank page when trying to enter the site. What to do? thank you

Can you attach a screenshot?
*http://en.wikipedia.org/wiki/Screenshot
*https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
*Use a compressed image type like PNG or JPG to save the screenshot
*Make sure that you do not exceed the maximum size of 1 MB
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.

Sec_error_unknown_issuer for a certificate trusted by every other browser

Dear Forum mebers,
I completely gave up this, so I hope somebody may have seen this issue and could resolve it :) We have an intranet corporate site, based on Windows Server 2012 R2 IIS server. I built up a single, WS2012R2 Standalone Root Certification Authority, and this CA only issued just one certificate -> for this site. After this, I imported the CA certificate to the trusted root certification authorities node via Group Policy.
Now, every single web browser can open the page without any problems (since the CA is trusted), only FireFox not. The issue happening is sec_error_unknown_issuer. What could I do with this? I tried to google a lot, but there is always speaking about intermediate certificates and certificate chain. But this time, there is absolutely no intermediate CA, since I have only a Root CA!
Are there any suggestions which I could try?
Thank you a lot for your help!
Best Regards,
Christian

Is that root certificate also imported in Firefox because Firefox uses its own certificate storage and stores extra certificates in the cert8.db file in the Firefox profile folder?
*Tools > Options > Advanced > Certificates: View Certificates
*http://developer.mozilla.org/NSS/tools/NSS_Tools_certutil

I can no longer access facebook, yahoo, even firefox support from the webbrowser!

I do not have any problem connecting to these websites from IE. What is going on with firefox?
YAHOO - "This Connection is Untrusted - You have asked Firefox to connect securely to www.yahoo.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."
FACEBOOK - "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."
FIREFOX - "This Connection is Untrusted - You have asked Firefox to connect securely to download.mozilla.org, 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."

hello Sasco9000, 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 security software are you using?
* 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 - don't add it for real, but inspect the certificate (see the screenshot attached for instructions):
* which '''issuer information''' does the certificate contain?
please report back with this information. thank you!
[["This Connection is Untrusted" error message appears - What to do]]

I can no longer access facebook, yahoo, even firefox from the webbrowser!

''locking this thread as duplicate, please continue at [https://support.mozilla.org/en-US/questions/1028681 /questions/1028681]''
FACEBOOK - "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."
FIREFOX - "This Connection is Untrusted - You have asked Firefox to connect securely to download.mozilla.org, 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."
YAHOO - "This Connection is Untrusted - You have asked Firefox to connect securely to www.yahoo.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."

hello Sasco9000, 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 security software are you using?
* 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 - don't add it for real, but inspect the certificate (see the screenshot attached for instructions):
* which '''issuer information''' does the certificate contain?
please report back with this information. thank you!
[["This Connection is Untrusted" error message appears - What to do]]

Firefox sec_error_unknown_issuer

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