ssl certificate for sub domains

I’m trying to understand if this scenario will work or not- I have a multisite set up with sub domains. My main site is One of my sub domains is The actual domain is which is mapped to the sub domain and I currently have about 20 sites running with this same configuration. I understand that if I purchase a wildcard SSL certificate that all the subdomains can share it. But- When a visitor comes to a site using the actual domain name and not the sub domain it’s mapped to will the SSL certificate still be valid?

  • Tyler Postle
    • CGO

    Hey lbartley,

    Hope you’re doing well today!

    The wildcard ssl will only be valid for the subdomains and main domain. So it won’t work for the mapped domain.

    A way around this is to force the unmapped subdomain on pages that require https.

    You can do this by going to a subsite and then going:

    Tools > Domain Mapping.

    On that page you will see at the bottom there are options for forcing https and forcing unmapped domain on specific pages. So for example if it’s a checkout page then you can force unmapped domain on the checkout page and force https on it. So when a user/visitor navigates to that page they will be servered the secure subdomain url instead of the mapped domain.

    Hope that helps! Let us know if you have any further questions :slight_smile:



  • lbartley
    • The Incredible Code Injector

    Thanks Tyler-

    I’m now looking at a PositiveSSL Multi-Domain certificate as described at this link- From what I understand I can put a certificate on 3 domains for $29.88 per year and additional domains for $10.88 each. 3 domains is all I really need them for right now but I need to allow for expansion. Will this type of certificate work in my situation?



  • Tyler Postle
    • CGO

    Hey Larry,

    That would work; however, keep in mind that this means your subdomains won’t be https, unless you also get a domain for them from your multi-domain cert too, so that would be some more money. Although, if your planning on strictly using the mapped domain then that wouldn’t be an issue.

    One other important note on Multi-domain certs is that they do have a limit of 100 domains. If you don’t expect many sites on your network then that’s fine, but the more sites you plan to put on their, the more you may want to consider the wildcard ssl and force the original subdomain when https is needed.

    Hope that helps!

    All the best,


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