Have you tried pointing a web browser directly at the URL to see if the XML is displayed? Many of the web service related issues with vCenter are related to SSL thumbprint mismatches. Try connecting to the ADAM instance using the LDP tool outlined in http://kb.vmware.com/kb/1025010 and confirm the thumbprint listed matches the thumbprint of the SSL returned by the web page when you access it directly. Also, take a look at the vws.log file. It might help pinpoint your issue.
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