From what I could see the ssl certificate chain isn't setup correctly, so the browser can't verify up to a trusted Root; If you have a commercially issued certificate you need to establish their Root Certificate Authority(ies) chain in the apache config by both installing & "trusting" the certificates on the server and using the SSLCertificateChainFile directive in your apache config. In your case you'd need PEM base64 (.crt) certificates for both the Verisign Root CA and their Intermediate Signing authority, which should have been sent to you.
Hardware and performance
Certificate problems
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