Securing SSL Certificates
Does an SSL certificate secure both www.coolexample.com and coolexample.com?
Yes, an SSL certificate secures the common name (domain name) listed in the certificate, with or without the "WWW" prefix.
NOTE: Until renewed, certificates issued prior to December 2006 only secure the exact, fully-qualified domain entered as the common name in the Certificate Signing Request (CSR). Thus, a certificate that secures "www.coolexample.com" does not secure the "coolexample.com."
The Subject Alternative Names (SANs) do not receive the same treatment.
In the case of UCC certificates or "Multiple Domain Certificates," only the primary domain name is secured both with and without www.
How does an SSL certificate work?
What does it mean to revoke an SSL certificate?
Determining the Type of SSL Certificate a Website Is Using
Protecting My Site Against the SSL Vulnerability in Debian GNU/Linux
How do I know my secure certificate is safe from vulnerabilities?
What happens when my certificate expires?
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