This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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

Invalid Certificate from FireFox

  • 5 replies
  • 19 have this problem
  • 23 views
  • Last reply by cor-el

more options

When using Firefox I get the following invalid security certificate message: static-ssl-cdn.addons.mozilla.net;443 uses an invalid security certificate. The certificate is not trusted because no issue chain was provided. Error code: sec_error_unknow_issuer

Is this a firefox issue? or the certificate you generate?

I do get the pop up panel indicating a "dangerous website" and accept the certificate exception. But then I get the above message. Lizette

When using Firefox I get the following invalid security certificate message: static-ssl-cdn.addons.mozilla.net;443 uses an invalid security certificate. The certificate is not trusted because no issue chain was provided. Error code: sec_error_unknow_issuer Is this a firefox issue? or the certificate you generate? I do get the pop up panel indicating a "dangerous website" and accept the certificate exception. But then I get the above message. Lizette

All Replies (5)

more options

Hi,

Please check if DigiCert Inc. which comes with a standard Firefox installation is listed in Tools (Alt + T) > Options > Advanced > Encryption > View Certificates > Authorities.

...............................................................................................................................

Useful links:

All about Tools > Options

Going beyond Tools > Options - about:config

about:config Entries

Page Info Tools (Alt + T) > Page Info, Right-click > View Page Info

Keyboard Shortcuts

Viewing Video without Plugins

Firefox Profile Folder & Files

Firefox Commands

Basic Troubleshooting

After Upgrading

Safe Mode

Problematic Extensions

Troubleshooting Extensions and Themes

Troubleshooting Plugins

Testing Plugins

more options

Yes, the DigiCert Inc is in the list.

Lizette

more options

I've attached a screenshot. Is it the same in the Add Exception... > View > Details, Certificate Hierarchy (chain)? If When an OSCP server connection,... is enabled in Tools (Alt + T) > Options > Advanced > Encryption > Validation, this error may be temporary. The error may also happen if you are connecting through a proxy or a security software that connects on behalf of the browser. If possible you should also try to update Firefox. I think version 5.0 is no longer officially maintained.

Modified by Vivek

more options

Please also see this.

more options

Who is the issuer of that certificate?

I see a different certificate chain for that specific domain (Akamai Subordinate CA 3 -> GTE CyberTrust Global Root), so they may be using more servers for load balancing and you may get a different server.

You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.

  • Click the link at the bottom of the error page: "I Understand the Risks"

Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate".

  • Click the "View..." button and inspect the certificate and check who is the issuer.

You can see more Details like intermediate certificates that are used in the Details pane.