What does the certificate show when you inspect it in the Firefox certificate viewer?

You can retrieve the certificate and check details of certificates.

• click "Advanced" to expand the error message
• click "Add Exception" to open "Add Security Exception"

If this isn't possible then open "Add Security Exception" by pasting this URL in the location/address bar and paste the URL of the website (https://xxx.xxx) in it's location field.

• chrome://pippki/content/exceptionDialog.xul

Let Firefox retrieve the certificate -> "Get Certificate"

• click the "View" button and inspect the certificate
  check who is the issuer of the certificate

You can see details like intermediate certificates that are used in the Details tab.

I have attached a screen shot of the certificate.

Screen shot of prior to certificate if that helps.

I tried adding the exception and importing the certificate. What should I be looking for ? It doesn't give a nice view like the one I posted. There are like a dozen or more lines to individually look at.

Firefox doesn't come with a root certificate for the VMware certificate and thus can't build a complete certificate chain that ends in a root certificate. I don't know if VMware comes with such a root certificate, so you would have to check the VMware docs or alternatively check the certificate chain if you have a browser that works.

I found the CA Certificate ... on my vmware vCenter server's default page after much searching. Bottom left hand corner. That was fun too! You have to save it as *.zip, extract and import all three files into Certificate Authorities tab.

Now I just have to figure out how to get the VM Client Integration Add-on to work?

Same problem was occurred.

I created vSphere6 evaluation environment, 6 month ago. This eval license was expired. I create new evaluation environment, as same hostname. Then, this problem was occurred.

Certfile was replaced but firefox could not work. IE and Chrome are good work.

I created new Firefox profile, then this problem was solved.