The Subject Name is the
primary name that matches the certificate to the DNS name in the URL. It is composed of the elements
discussed in the following table:
Element Definition Example
Common Name (CN) The fully qualified domain name
(FQDN) for the URL / server
Webmail.ExchangeExchange
.com
Subject Alternative Name
(SAN)
Alternate fully qualified domain
name (FQDN) for the URL /
server
Autodiscover
.ExchangeExchange.Com
Organization Name (O) The Full Legal Company Name
or Personal Name
ExchangeExchange
Organizational Unit (OU) Typically the branch or group
ordering the certificate
Information Systems
Domain Component (DC) Part of a DNS name DC=com,
DC=ExchangeExchange
Country (C) The two-letter country code
using the ISO 3166 country
names
US
State (S) The state??™s full name Illinois
Locality (L) The locality or city full name Chicago
Chapter 6: Confi guring the Client Access Server Role
173
So, putting it all together, a Subject Name may look like this:
C=US, S=Illinois, L=Chicago, O=ExchangeExchange, OU=Information Systems,
CN=webmail.exchangeexchange.com
For some certificate issuers the company listed in the Organization Name (O) must own the domain
name that appears in Common Name. If it does not match, it may fail to issue the certificate.
Running the New-ExchangeCertificate cmdlet without any parameters generates a self - signed
certificate.
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