Type ‘ appwiz.cpl’ in the text field of the dialog box and press Enter to open up the Programs and Features window.To open the Run dialog box, press the Windows key + R simultaneously.If it happens to be, you might want to replace it with another program. This will help you identify if your antivirus program is the culprit behind the SEC_ERROR_UNKNOWN_ISSUER error. In the event that you are sure the website you’re trying to visit is legitimate, you can try disabling the third-party tool temporarily. Such programs prevent legitimate processes of the browser to complete successfully. Interruptions between the end-user and the server can also be caused by an overly protective antivirus program. Lastly, disable each extension by flipping its switch to the off position and check if doing so resolves the issue.Click on Addons in the context menu displayed.Launch the Firefox browser and click on the hamburger menu at the top of the window to open its menu.Doing so will reset the modules and give them a fresh start. It is possible to resolve the issue by disabling extensions temporarily. There may be a temporary bug in Firefox that is causing the issue. In some cases, you might as well face the error if your computer is infected with some sort of corruption error or a virus.īelow we have listed several effective troubleshooting solutions for you to resolve this issue, so let’s get right into it! Disable Extensions The same error code is also sometimes displayed with a message stating ‘warning: potential security risk ahead’. A SEC_ERROR_UNKNOWN_ISSUER message indicates that your certificate issuer isn’t trusted by your browser. CAs follow strict guidelines in this regard to make sure they’re doing their due diligence regarding validation and granting certificates in good faith. The Public Infrastructure Key (PKI) is designed such that only trusted certificate authorities (CAs) can issue trusted certificates. A SEC_ERROR_UNKNOWN_ISSUER error code in Firefox indicates that a website is trying to use an SSL certificate issued by an untrusted issuer.
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