Restart your PC and open the website again to see if SEC_ERROR_UNKNOWN_ISSUER is solved. If this cannot detect the virus, try another antivirus program like Malwarebytes.Īfter the scan, remove the virus. Just try Windows Defender if you are running Windows 10. Thus, running a virus scan for your entire Windows system could be helpful. If a virus is preventing the certificate from being detected, the error code may occur. So, how can you fix the error code? Here is something you can do! Firefox SEC_ERROR_UNKNOWN_ISSUER Fix Option 1: Run a Virus Scan Additionally, if your computer is infected by malware or virus, it is likely that you also come across this error. This error code means the certificate is not unknown by Firefox and therefore it cannot be trusted by default. Sometimes you see the message “warning: potential security risk ahead” with the same error code. Usually, you get an error message showing “ your connection is not secure” with the error code sec_error_unknown_issuer. If it cannot be validated, Firefox can disconnect the connection to the web page. When using Firefox to visit a website, this browser will verify the certificate used by the website is valid. In this article, MiniTool Solution offers some possible and useful solutions to help you out. This indicates that the website is using an SSL certificate that was issued by an untrusted entity. When opening a web page in Firefox, you may receive the error code: SEC_ERROR_UNKNOWN_ISSUER.
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