What Domain Name Should I Use to Apply for an SSL Certificate?

This topic uses examples to describe what domain names should be used during certificate application.

Assume the following: your website is www.domain.com; it has a user login page, which is http://www.domain.com/login.asp; you want to apply for an SSL certificate to ensure the username and password security for your users against theft during data transmission; it has a user login information management page, which is http://www.domain.com/oa/manage.asp; you want to apply for an SSL certificate to ensure the security of confidential information on that page. In this case, you can use www.domain.com to apply for an SSL digital certificate to protect those pages.

If your website has large access traffic, you are advised to set an independent web server (HTTP server) for the pages that require SSL digital certificates and use an independent domain name to apply for an SSL certificate, for example, secure.domain.com or ssl.domain.com.

The domain name used together with https:// must be the same as that used for applying for an SSL digital certificate; otherwise, the browser may display a warning indicating that the name on the certificate is invalid or inconsistent with the site name. Use a proper domain name to apply for an SSL certificate for your website based on your conditions.