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Why do I get a name mismatch error when using my certificate on https://domain.com when it is issued to www.domain.com?

A certificate is issued to a domain name (such as domain.com) or a fully qualified domain name (such as www.domain.com).  A browser will compare what is in the address bar with the "issued to" field in the certificate, and if they do not match will present an error to the user.

You would therefore not be able to use a certificate issued to www.domain.com on domain.com without the browser displaying an error.  To avoid this issue you would require two certificate - one issued to each iteration.  You would also need two unique IP addresses if they are to reside on the same server.

 

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