It's an IE error message.

Thanks,
Betty

Also, if you do a Google search with part of the error message in quotes, you will see quite a few people with a similar situation.

Often a cert is assigned to www or not, i.e., [example.com...] or http://example.com, not both.

How are you accessing your site?

Certificates are most often issued to a specific host name. If it was issued to "www.example.com", you will get an error message if you access your site through some other domain (e.g. "example.com", or "forums.example.com"), through an IP address, or through, say, a hosting provider's domain name (hostingcompany.tld/example).

I'm guessing that the problem it's one of the latter, since you - the webmaster - are the only one having the problem, and others are not. Are you accessing your site through a link in your website control panel?

Wildcard certificates can be a solution to this, but really aren't needed for most sites. A wildcard certificate is issued for an entire domain, not just a specific host in the domain. But most sites just have "www/non-www" and should be redirecting one to the other anyway, so no need for a wildcard.

I have heard from thawte and they have discovered the problem. When my cert was renewed, there was a "slight" change in the cert number and my "official" webmaster didn't pick that up, so old cert was still installed on my website causing the problems.

Betty