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I have only one subdomain configured, and it works properly. But if I request any other random subdomain whatever.mydomain.com, it returns an invalid certificate warning in the browser:

This website may be impersonating "foobar.mydomain.com" to steal your personal or financial information. You should go back to the previous page.

How do I do disable all other subdomains so that instead they return server not found errors:

Safari can't open the page "https://foobar.mydomain.com" because Safari can't find the server "foobar.twitter.com".

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Delete the wildcard DNS entry from your DNS records. Create records only for those subdomains which you intend to be accessible.

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