Hey there!

Please see the following links for how to solve this issue:

https://support.mozilla.org/en-US/kb/secure-connection-failed-firefox-did-not-connect https://support.mozilla.org/en-US/kb/error-codes-secure-websites https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean

Depending on the type of error message you get, you need to respond differently. Could you please tell what was the specific error message?

Thank you and hope I helped!

Kind regards,

Bithiah

Please provide a public link (no password) that we can check out. No Personal Information Please !

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

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

Websites don't load - troubleshoot and fix error messages

http://kb.mozillazine.org/Error_loading_websites

What do the security warning codes mean

Hey there!

If your problem is solved, please mark a solution so that others can see this thread is solved. Thank you in advance!

Kind regards,

Bithiah