Thank you for the prompt reply. The link and suggestions were helpful.
Since the database and CA are already migrated to the new ESMC appliance and I need to update the 6.5 agents to 7.2 My thought is to:
1. create a new server cert on the new ESMC appliance leaving host as the defualt *.
2. change the server cert on the new ESMC appliance to the new cert.
3. Redeploy the agent using a 3rd party deployment tool.
I did notice that in the agent installer package advanced tab, in the Server Hostname Optional field. The database pull retained the old ERA.domain.com v