I keep getting the message -- The certificate for this server is invalid. You might be connecting to a server that is pretending to be "buy.itunes.apple.com. --- how do I fix this problem or get around the message.

I keep getting the message -- The certificate for this server is invalid.  You might be connecting to a server that is pretending to be "buy.itunes.apple.com.  --- how do I fix this problem or get around the message.

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