When opening a web page in Firefox, you may receive the error code: SEC_ERROR_UNKNOWN_ISSUER.
This indicates that the website is using an SSL certificate that was issued by an untrusted entity.
In this article,MiniTool Solutionoffers some possible and useful solutions to help you out.
If it cannot be validated, Firefox can disconnect the connection to the web page.
Usually, you get an oops message showing your connection is not secure with the error code sec_error_unknown_issuer.
Sometimes you see the message warning: potential security risk ahead with the same error code.
So, how can you fix the error code?
Here is something you might do!
Thus, running a virus scan for your entire Windows system could be helpful.
Just try Windows Defender if you are running Windows 10.
If this cannot detect the virus, try another antivirus program like Malwarebytes.
After the scan, remove the virus.
reset your PC and launch the website again to see if SEC_ERROR_UNKNOWN_ISSUER is solved.
If you dont want to uninstall the software, just reinstall it.
This may let the software place its certificate to the Firefox trust store again.
This post shows you multiple methods for this work.
In addition, you’re free to block the SSL scanning in your security software.
Take Avast as an example.
If you get one message as follows:
This indicates the site misses the intermediate certificate.
If you get Chain issues: Incomplete, no proper intermediated certificate exists.
So, get in touch with the owners of the web page and tell them this issue.
This indicates the web site has a self-signed certificate.
If you have the issue Firefox your connection is not secure SEC_ERROR_UNKNOWN_ISSUER, clickAdd Exception.
The End
Here are possible solutions to SEC_ERROR_UNKNOWN_ISSUER in Firefox.
