Certificate error only when using www

We recently installed a wild card cert on one of our web servers. When connecting to the site using just the https://site name, it works fine with no errors.

But, when we add the www like https://www.sitename.com , we get a certificate error. What did we miss?
Eddie CrosbyAsked:
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Steve WhitcherSystems AdministratorCommented:
Without seeing the certificate, it's difficult to say.  The Subject Name of the certificate should be something like: *.sitename.com  

Is that what you have?  
Are there any Subject Alternative Names (SAN) listed?

On the computer you are browsing FROM, is the network adapter configured to append a domain suffix?

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Eddie CrosbyAuthor Commented:
Accepting as answer. We just went back and renewed and reinstalled the cert.
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