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I'm looking at getting an SSL certificate and I think the SAN type is what I need. However, Can I easily add further domain names to be covered by the certficate in the future. E.g. I have www.example.com on my server. In 6 months time I decide to build and host a new site on the same server and give it the URL www.example2.com. Would I then be able to add the new domain to the existing certificate?

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Certificates cannot be changed after they are signed, otherwise they would provide no security.

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Once issued, a certificate holds all SANs. This means that a certificate would have to be revoked and a new one has to be issued to add a new SAN.

You should first find out which names you want to register, because revoking and reissueing will most likely cost extra money.

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Its not possible to add domain in the existing SAN SSL Certificate, you can temporarily self-signed the certificate for the other domain you are thinking for and then at the time of expiration(after 1 or 2 year validity) you have to apply a new SAN to include your new domain name.

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