Hi Bob,
Welcome to the communitys!
Just checking did you get to take a look at : http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1013472
If that doesnt appear likely check out
http://runningvm.wordpress.com/2010/08/31/vsphere-plug-in-unable-to-connect-to-the-remote-server/
Many tx