Could you check out the Kaspersky section of this article: How to troubleshoot security error codes on secure websites. Does that help?

Or to set up Firefox to work with Kaspersky's scanning feature, you can add the Kaspersky signing certificate as a trusted authority to sign fake certificates for other sites. It's possible Kaspersky will do that for you at Windows startup or some other triggering event, but if you have to do it by hand:

(Based on information from Kaspersky's forums)

Open Firefox's Certificate Manager:

"3-bar" menu button (or Tools menu) > Options

In the left column, click Advanced

On the right side, make sure the Certificates mini-tab is selected and then click the View Certificates button

In the Certificate Manager dialog, click the "Authorities" mini-tab (not the Personal or Servers mini-tab, which might initially be displayed by default)

If you see an existing "Kaspersky Anti-Virus Personal Root Certificate"

• Select it and Click "Delete or Distrust"

Now click "Import..."

Proceed to "C:\ProgramData\Kaspersky Lab\AVP16.0.0\Data\Cert\"

Select "(fake)Kaspersky Anti-Virus Personal Root Certificate.cer" and Open!

Set Firefox to trust that certificate for websites, and ignore the other two options.

Then you can test various secure sites to see whether Firefox now trusts the fake certificates. If it doesn't work right away, exit out of Firefox and start it up again.

thanks for your help - I ended up simply doing a Refresh Firefox and the problem was solved. thank you for your assistance,