Hello WarrenM01,

Thanks for the suggestions , here are the responses:

1.Yes 5.3 does helps , and as I mentioned in my post , I have already did a clean re-install of these components in correct order. Uninstalled agent then tools. Reinstalled tools and agent 6.1.1. but the error still persisted.

2. I would say it is recent , to make the picture clear this is a new env and sort of "replica" of another env in different geography. So I copied the master image from some other region to this region and changed the domain.( I believe sysprep will take care of rest of the things) . Now this is not the first time I have done something like this , I have copied images from different geographies to other regions with the same process and they always worked(with agent 6.1.1 as well). All environments are same in terms of configuration and settings.

Part 2  - In the VDM log on connection server , I see some events post restarting the agent :

2017-04-06T13:54:36.098+08:00 DEBUG (0C70-1488) <VirtualCenterDriver-58e0ab92-a214-4ed6-b254-4f8aafe6f4c1> [VirtualCenterDriver] VM Name:vm-001, VM IP:null ,GuestInfo Agent [Error Code:ffffffff, Error Text:javax.jms.JMSException: Unable to create a connection to: [[ServerEntry, hostname=connectionS2.domain.com, port=4002]], Active Broker:connectionS2.domain.com connectionS2.domain.com/10.94.100.100]

same event for other connection server, also I see events related to restart of VM(related to sysprep, maybe !) during customisation.