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our server url schema is setup like this:


For example:


So the clients.example.com never really changes but customer-domain and extension do.

What would be the most reliable and cheap way to set up SSL certificates for this server?

Thanks, Slav

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1 Answer 1

up vote 2 down vote accepted

The RFC states that wildcards are only good for the next level down. So in your above examples you would need to get a wild card for each extension:


Personally, I would drop the extension part of your scheme and have a wildcard for


Now, some browsers support multiple levels for wildcard certs, but this is not universal and against the RFC anyway.

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