Which FQDN hostname to use for SSL certificate signing request- when using a CNAME record?

We have a subdomain (https://portal.company.com) that is the alias for a different hostname (defined in a CNAME record).

This dynamic DNS hostname (https://portal.dlinkddns.com) resolves to the public (dynamic) IP address of our office. At the office, the router is configured to forward port 443 to a server running a (Spiceworks) web portal that the staff can access from home. Even if the office's public IP address changes, the subdomain will still direct staff to the web portal. Everything works great- apart from the (expected) SSL certificate error staff see when they first connect to the site.

I've just purchased an SSL certificate, and am now in the process of completing a certificate signing request on the server.

Which leads me to my question...

When completing the certificate signing request, for "Common Name (e.g. server FQDN or YOUR name)", what should I enter?

Should I enter the canonical name (https://portal.dlinkddns.com) or the alias (https://portal.company.com)? The FQDN of the server itself is "servername.companyname.local"- so I can't use that.

Any suggestions or ideas would be much appreciated!

Answer

You use the name the service is accessed as. So if your portal clients visit https://portal.dlinkddns.com, use portal.dlinkddns.com. And if they visit https://portal.company.com, use portal.company.com.

If your clients will access both, get a certificate with one of the names as DN and the other as subjectAltName, so it can be used for both.

If I'm reading correctly between the lines of your question, all that will be accessed in a browser is https://portal.company.com, so in your case: get a certificate for that name.

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