Since 64-bit version of Firefox is not yet supported by Kaspersky, you can try to uninstall Firefox 64-bit and then install the regular 32-bit version of Firefox and your problem will be solved. If you face this problem, you can try following solutions: If you are also using Mozilla Firefox 64-bit version and Kaspersky antivirus or Internet security suite in your computer, you might also face this problem. That’s why it might show that error message when you try to open HTTPS websites in Firefox 64-bit version. Since Firefox 64-bit version is very new, there is no support for it yet in Kaspersky program. This untrusted connection issue might appear if you are using a 64-bit version of Mozilla Firefox along with Kaspersky security suite. Kaspersky staff member told the reason as following:
There was also a thread at official Kaspersky Lab forums regarding the same problem and a user was having similar problem while trying to access Google and Bing websites. It was happening due to Kaspersky security program which was blocking HTTPS websites due to a certificate related issue. PS: In newer Firefox versions, you may receive “ Secure connection failed“, “ Your connection is not secure“, “ Secure connection cannot be established“, “ Warning: Potential Security Risk Ahead” and “ Did Not Connect: Potential Security Issue” errors and warning messages.Īfter some troubleshooting, he was able to find out the culprit. An additional root certificate may need to be imported. The server might not be sending the appropriate intermediate certificates. The certificate is not trusted because the issuer certificate is unknown. As a result, it is not possible to add an exception for this certificate. This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. 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. However, this site’s identity can’t be verified. Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. You have asked Firefox to connect securely to but we can’t confirm that your connection is secure.