SSL error for www subdomain

I cannot access the www version of my site which is a subdomain of The problem only occurs when I type the www in front. Please help.
Unsupported protocol

The client and server don’t support a common SSL protocol version or cipher suite.

Regular SSL certificates only cover *, not *.* so a second-level subdomain like won’t work due to how SSL certificates work. If you want to get this working, you’ll need a dedicated certificate with the hostname * on it.

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