Got the answer from support on this one - looks like an older Microsoft security update was clobbering the SSL connection between VCM and my vSphere server because vSphere only had the default certificates installed. Had to remove KB 2661254 temporarily because it does not allow usage of certs lower than 2048 bits. Removing the patch allowed the Plugin to register with the vSphere server. Next on my plate is to look at generating and installing new certs for my vSphere/ESX environment using our internal CA.
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