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I have a wildcard SSL from Godaddy. When I go here:
https://conciergelive.conciergeliveapp.com/users_session/new Everything is fine. But when I go here:
https://es.conciergelive.conciergeliveapp.com/users_session/new I get a security alert. I need the extra subdomain to determine locality. Any ideas why this does not work?
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The simple answer is a resounding Yes! You absolutely can use one SSL certificate for multiple domains — or one SSL certificate for multiple subdomains in addition to domains.
A wildcard SSL certificate is used if you have multiple subdomains that need to be secured at the same level. A single certificate is issued to encrypt your domain along with an unlimited number of subdomains.
A multi-domain wildcard SSL certificate is the perfect solution for situations where you need to secure multi-level subdomains. It allows encrypting multiple levels of subdomains with one certificate. Like the wildcard certificate, it can work whether the sites are on the same or separate servers.
A Wildcard SSL certificate is marketed as being able to secure “unlimited subdomains” and that's partially true but with the caveat that all those sub-domains must be at the same level of the URL.
According to RFC 2818 Http Over SSL, section 3.1:
Names may contain the wildcard character * which is considered to match any single domain name component or component fragment. E.g., *.a.com matches foo.a.com but not bar.foo.a.com
it explains why the name *.conciergeliveapp.com in the certifacte matches conciergelive.conciergeliveapp.com but not es.conciergelive.conciergeliveapp.com
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