I can make a single SSL certificate for several different domain names:

www1.example.com
www2.example.com
www3.example.com

But *.example.com doesn't work.

How can I make a single SSL certificate for all sub domains within .example.com?

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P.S. Here is the extension part of the generated certificate:

    X509v3 extensions:
        X509v3 Basic Constraints: 
            CA:FALSE
        X509v3 Key Usage: 
            Digital Signature, Non Repudiation, Key Encipherment
        X509v3 Subject Alternative Name: 
            DNS:*.example.com

It's simply not matched by any sub-domain under example.com by the browser.