This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Firefox Nightly updated and now I can't access my banking or financial websites? What can I do to resolve this?

  • 2 replies
  • 1 has this problem
  • 13 views
  • Last reply by cor-el

Tbear1261
Tbear1261
more options

Hello,

I am using Windows 10 Pro 64 bit and using Firefox Nightly. Nightly performed a couple of updates today, 2-22-18, and now I am unable to access my banking or financial online websites. I receive a "your connection is not secure" error. Yesterday, 2-21-18, I was able to navigate to all my banking and financial websites without any problem. Currently, I am not even able to get to a login screen to the websites. I can however, navigate to all the websites using Microsoft Edge. However, I do not like using Microsoft Edge as my web browser and much prefer Firefox Nightly.

I would like to have some help resolving this issue with Firefox Nightly.

Thank you very much,

Terry Small

Here is an image of the error that I am receiving:

Your connection is not secure

The owner of online.southwestnb.com has configured their website improperly. To protect your information from being stolen, Nightly has not connected to this website.

This site uses HTTP Strict Transport Security (HSTS) to specify that Nightly may only connect to it securely. As a result, it is not possible to add an exception for this certificate.

Learn more…

Report errors like this to help Mozilla identify and block malicious sites

Hello, I am using Windows 10 Pro 64 bit and using Firefox Nightly. Nightly performed a couple of updates today, 2-22-18, and now I am unable to access my banking or financial online websites. I receive a "your connection is not secure" error. Yesterday, 2-21-18, I was able to navigate to all my banking and financial websites without any problem. Currently, I am not even able to get to a login screen to the websites. I can however, navigate to all the websites using Microsoft Edge. However, I do not like using Microsoft Edge as my web browser and much prefer Firefox Nightly. I would like to have some help resolving this issue with Firefox Nightly. Thank you very much, Terry Small Here is an image of the error that I am receiving: Your connection is not secure The owner of online.southwestnb.com has configured their website improperly. To protect your information from being stolen, Nightly has not connected to this website. This site uses HTTP Strict Transport Security (HSTS) to specify that Nightly may only connect to it securely. As a result, it is not possible to add an exception for this certificate. Learn more… Report errors like this to help Mozilla identify and block malicious sites

All Replies (2)

FredMcD
FredMcD
more options

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

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

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

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

https://www.bing.com/search?q=web+site+access+denied


  • uses an invalid security certificate SSL_ERROR_BAD_CERT_DOMAIN
  • configured their website improperly

How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Hmm. I see the same if I use the current Nightly build. The certificate chain looks OK when I check this in the Servers tab, so I don't know what gets wrong here. It could be an issue with the signature or something else. Things like this can always happen if you use an unstable Nightly build.

Try the mozillaZine Builds forum to see if this is a known issue.