FireFox: Error code: sec_error_untrusted_issuer

FireFox: Error code: sec_error_untrusted_issuer

You may receive the below error in FireFox when attempting to add a SSL certificate security exception. If you do follow the below steps to be able to actually add the security exception.

Error: uses an invalid security certificate.
The certificate is not trusted because it is self signed.
(Error code: sec_error_untrusted_issuer)

Image of Error:

FireFox Error: sec_error_untrusted_issuer

Follow these steps to add an SSL certificate security exception in FireFox.

  1. Visit URL: Visit the HTTPS URL in question. For example You will come to a page that looks like the below image.

    FireFox: Secure Connection Failed

  2. Click Link: Click the “or you can add an exception” link at the bottom of the white box. This will display two buttons at the bottom as shown in the below image.

    FireFox: Add Exception

  3. Click Add Exception: Now click the Add Exception button which will open a new window as shown below.

    FireFox: Get Certificate

  4. Modify Location: Now here is where a lot of people run into the issue. They attempt to Get Certificate without adding the port number. So modify the location by adding “:443” to the end. Your new Location would look like
  5. Click Get Certificate: Now click the Get Certificate button which will now provides functionality to the Confirm Exception button as shown in the below image.

    FireFox: Confirm Security Exception

  6. Confirm Exception: Now click the Confirm Exception button located at the bottom of the window. Once clicked you will be redirected to the page you initially attempted to visit. All future visits to the page will direct you right to the page without having to add the certificate every time.

Check out the below books for more information about FireFox.

Greasemonkey Hacks: Tips & Tools for Remixing the Web with Firefox (Paperback)

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Firefox For Dummies (Paperback)

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