I just had the same problem and it was determined that when linking the servers back in 6.5 there was something that happened to the services certificates on the second vCenter. We ended up unregist...
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I just had the same problem and it was determined that when linking the servers back in 6.5 there was something that happened to the services certificates on the second vCenter. We ended up unregistering and reregistering all of the services and running a couple other scripts to clean up the certificates.. I don't have all of the steps the tech performed but the bottom line is that they reset all the services and then ran a fixsts.sh script before rebooting vCenter and then everything was working..
