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I haven found a answer to the question from 2013 but is this answer still valid with SNI.

SSL wildcard certificates and trailing 'www'

Is it possible to have a certificate or SAN with www.*.domain.com which works with current Browsers?

example:

plain www.subdomain1.domain.com/ => secure www.subdomain1.domain.com/ plain www.subdomain2.domain.com/ => secure www.subdomain2.domain.com/

I know how to configure nginx to accept the domain but I'm not sure if the browser accept the certificates.

Many thanks for answers.

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Aleksandar
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    No, browsers won't accept such certificate. Wildcard sign is allowed only at left position and only once. Configurations such `www.*.domain.com` and `*.*.domain.com` are not allowed. – Crypt32 Jan 02 '17 at 12:10
  • As per Wildcard SSL security policy, it only allows you to secure *.domain.com or *.subdomain1.domain.com, but it won't allow you to secure www.subdomain1.domain.com. – Jake Adley Jan 03 '17 at 05:47

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