"To prevent browser warnings, use an SSL certificate with a common name or subject alternative name that contains the fully-qualified domain name of the server that hosts the certificate."
If the domain name (FQDN) in the TLS/SSL certificate doesn't match exactly the domain name displayed in the address bar of the browser, the browser stops the connection to the website and displays a name mismatch error. Errors create mistrust when connecting to a site and can cause clients to avoid your site (see Name Mismatch in Web Browser).
When you order a TLS/SSL certificate, the domain name on the TLS/SSL certificate must match the domain name for the website shown in the address bar of the browser exactly. For example, to get a certificate for www.example.com, you must add www.example.com as a common name or SANs (FQDN) in the order form.
DigiCert is the world's leading provider of scalable TLS/SSL, IoT and PKI solutions for identity and encryption. The most innovative companies, including 89% of the Fortune 500 and 97 of the 100 top global banks, choose DigiCert for its expertise in identity and encryption for web servers and Internet of Things devices. DigiCert supports TLS and other digital certificates for PKI deployments at any scale through its certificate lifecycle management solution, CertCentral®. The company is recognized for its enterprise-grade certificate management platform, fast and knowledgeable customer support, and market-leading security solutions. For the latest DigiCert news and updates, visit digicert.com or follow @digicert.
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