I keep getting a "secure connection failed" error message on select, definitely secure sites. What to do?
The sites which I am unable to access are unquestionably authentic and have up-to-date certificates - they are banking sites, credit card, utility companies, etc. I am able to access them on Firefox on my kid's computer, but not my own. Any help would be appreciated.
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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
In most cases, it's either your Anti-Virus's HTTPS scan that is passing a certificate incorrectly or you have malware on your computer trying to steak your credentials.
Download Malwarebytes Anti-Malware Free and the program JRT for their site and run those to be sure.
You can click the "Advanced" button to expand this section and show extra details. You can click the blue error message to expand this section. If the certificate is not trusted (SEC_ERROR_UNKNOWN_ISSUER) then click "Copy text to clipboard" and paste the base64 encoded certificate chain text in a reply. That will allow us to check details like the issuer of the certificate.