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Verisign SSL (Error code: sec_error_unknown_issuer) on firefox 11


In HongKong firefox didn't support this link with error.

(Error code: sec_error_unknown_issuer)

tried two version 10.0.2 and 11. SUSE Linux Enterprise Server 10 (x86_64) VERSION = 10 PATCHLEVEL = 4 LSB_VERSION="core-2.0-noarch:core-3.0-noarch:core-2.0-x86_64:core-3.0-x86_64"

Additional System Details

Sites Affected


Installed Plug-ins

  • Google Update
  • Shockwave Flash 11.1 r102
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.2
  • iTunes Detector Plug-in
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • npaliedit
  • npwangwang
  • 4.0.60531.0
  • Picasa plugin
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Next Generation Java Plug-in 1.6.0_24 for Mozilla browsers
  • The plug-in allows you to open and edit files using Microsoft Office applications
  • Office Authorization plug-in for NPAPI browsers
  • np-mswmp


  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko/20100101 Firefox/11.0

More Information

apps.wwf.org.hk uses an invalid security certificate.
The certificate is not trusted because no issuer chain was provided.
(Error code: sec_error_unknown_issuer)

  • Top 10 Contributor
  • Moderator
10749 solutions 96724 answers

That is a problem with that server because it doesn't send a required intermediate certificate (VeriSign Class 3 International Server CA - G3).

You can find the VeriSign intermediate certificates on the VeriSign site and save the code to a text file and use File > Open File to install the certificate.

You need the second certificate from this page.

On this page there are two other intermediate certificates (Class 3 CA - G2 and G3)

Modified by cor-el

Question owner

Thanks for your reply. So I install second certificate is fine? We are using Secure Site https://knowledge.verisign.com/support/ssl-certificates-support/index?page=content&id=AR1409

  • Top 10 Contributor
  • Moderator
10749 solutions 96724 answers

I got the wrong certificate the first time, I hadn't tested it and I edited my above to give a link to the correct certificate.

It is the second certificate on this page (Secondary SSL Intermediate CA Certificate):

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

Question owner

Thanks for provide useful website. Don't understand why will using secure-site-pro secondary cert but it is work. SSL Certificate correctly installed. Thanks again.

  • Top 10 Contributor
  • Moderator
10749 solutions 96724 answers

You're welcome.

Firefox will store intermediate certificates automatically if you visit a site that sends them, so if you haven't yet visited a site that has send it and then visit a site that doesn't send it, like in your case, then you get that SSL certificate error.