Join us to show up for other Firefox users 🦊. Earn fun badges and Mozilla swag vouchers! Find out more: https://mzl.la/askafox150

Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Error: sec_error_unknown_issuer

  • 1 reply
  • 1 has this problem
  • 211 views
  • Last reply by philipp
  • Archived

Our company has an AD environment. So our internal web site use the self-signed certificate. The root certification is our AD certification. When i access our internal web site, it will show :sec_error_unknown_issuer". If i import the root certification into firefox, the issue will been resolved.

However, the number of computers there are more than five hundred. Do you have any quick way to import the root certificate? Or other function to resolve my question?

Our company has an AD environment. So our internal web site use the self-signed certificate. The root certification is our AD certification. When i access our internal web site, it will show :sec_error_unknown_issuer". If i import the root certification into firefox, the issue will been resolved. However, the number of computers there are more than five hundred. Do you have any quick way to import the root certificate? Or other function to resolve my question?

All Replies (1)

hi, https://mike.kaply.com/2015/02/10/installing-certificates-into-firefox/ lists some ways to deploy custom certificates at a larger scale.