Why Is My Wildcard SSL Not Working on a Second Level Subdomain?

An In-Depth Look at Why a Wildcard SSL Certificate Causes a Domain Mismatch Error on a Second Level Subdomain

We know, you’re here because your wildcard SSL is not working on a second level subdomain for some reason. To help you understand why, we first need to tell you a bit about wildcard SSL certificates and what they do and don’t secure. The digital certificate industry is, at times, needlessly opaque about what its products actually do. The wildcard is one of the biggest offenders. It’s often marketed as securing “unlimited subdomains.” And that’s partially true — with one important caveat:

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