Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

On some sites we get sec_error_unknown_issuer SSL error due to missing root certificate TC TrustCenter Class 2 L1 CA XI. Firefox is the only browser having this issue. Why is that certificate not preinstalled and shipped with Firefox?

  • 3 replies
  • 3 have this problem
  • 4 views
  • Last reply by cor-el

more options

On some sites we get sec_error_unknown_issuer SSL error due to missing root certificate TC TrustCenter Class 2 L1 CA XI. Firefox is the only browser having this issue. Why is that certificate not preinstalled and shipped with Firefox?

Check sales.sauer-danfoss.com for details with Firefox 7. Thanks Stefan

On some sites we get sec_error_unknown_issuer SSL error due to missing root certificate TC TrustCenter Class 2 L1 CA XI. Firefox is the only browser having this issue. Why is that certificate not preinstalled and shipped with Firefox? Check sales.sauer-danfoss.com for details with Firefox 7. Thanks Stefan

All Replies (3)

more options

You are not sending the TC TrustCenter Class 2 L1 CA XI intermediate certificate

Web servers need to send all required intermediate certificates to build the chain to build-in root certificates. You need to install that intermediate certificate on your server.

You can test the certificate chain via a site like this:

more options

We will go away from TC Trustcenter to Globalsign Thanks

more options

You're welcome