What is the FQDN the signing request is for? -----BEGIN CERTIFICATE REQUEST-----

Question

What is the FQDN the signing request is for?

-----BEGIN CERTIFICATE REQUEST-----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-----END CERTIFICATE REQUEST-----

Explanation / Answer

A Fully Qualified Domain Name (or FQDN) is a complete and unambiguous domain name that specifies an exact location for an object in a Domain Name System (DNS) hierarchy. It specifies all domain levels, including the top-level domain and the root zone. Most domain names as used in the internet’s Uniform Resource Locators (or URL) are only partially qualified (but work just fine).

A fully qualified domain name can be interpreted only in one way – it is a completely unique address for one and only one location.Each element of a FQDN refers to a domain level, and the elements of a FQDN are separated by periods. Technically, a FQDN will always end with a period as well – thus, for example, a mail server named “mail” under the domain “somedomain.com” would use the FQDN:mail.somedomain.com.

Note that when entering a FQDN in DNS zone files the final period is required – however, on most other occasions where you are asked to enter the FQDN (such as when filling out your submission form for an SSL.com certificate) can safely leave off the terminal period. Most modern software, including ours, takes care of this for you.

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.

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