Can you post a link to that website?

It is possible that the server doesn't send a required intermediate certificate. Firefox stores intermediate certificates that servers send for future use, so if you have visited a website that has send such a certificate then you won't see an error if you visit a server that doesn't send that intermediate certificate.

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

• http://www.networking4all.com/en/support/tools/site+check/

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.

cor-el, Here is a link to this particular website.

https://www.canadadrugs.com/accounts/index.php

Thanks.

The www.canadadrugs.com server doesn't send a required intermediate certificate.

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

• http://www.networking4all.com/en/support/tools/site+check/

You can install (import) the second certificate (Secondary EV SSL Intermediate CA Certificate) from this VeriSign website.

• https://knowledge.verisign.com/support/ssl-certificates-support/index?page=content&id=AR1728

You can Copy and Paste the certificate text of the intermediate certificate to a .cer text file and import the certificate in the Certificate Manager or via Firefox > New Tab > Open File.

DO NOT set any trust bits, those are only required for root certificates and should never be set for intermediate certificates.

Just to clarify, do I copy and paste the Secondary Certificate to Windows Notepad and then save as a xxx.cer file. (Since Notepad's default "Save As" is a text (.txt) file?

Thanks

Make sure to select the "All Files" type and not "Text files" when you save the file in Notepad (Text files will append a hidden .txt file extension).