Contact Google at the Google Checkout support site and explain your SSL configuration. My bet is you will need your own SSL certificate for Live/production purposes.
But you don't need SSL to test GC in the Sellers sandbox. You did not say if you Were you testing in the sandbox when you observed the results?
Did you set the responsehandler for http (not https) in both Google Checkout Sellers Account profile and in the GC payment mod configuration in ZC?
In the Google Checkout profile did you select XML (not HTML)?
What relevant info displays within both your error and response logs in /googlecheckout.
Woody
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