When connecting to an internal website, I'm getting an error: "Certificate contain unknown critical extension." What does this mean?

I am getting a connection failure when trying to connect to an internal web site:
Secure Connection Failed
An error occurred during a connection to <sitename>.
Certificate contains unknown critical extension.
(Error code: sec_error_unknown_critical_extension)
Can you give me a general idea what the error is and why I would be getting this error?
Thanks in advance...

The instructions here might help
http://support.apple.com/kb/TS3297

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