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I believe it is just port 443 which is part of the vCHS endpoint you have added to vCAC as you are effectively using a REST api over HTTPS. If you do lock down the port to the vCHS API URL, do you have any connectivity issues? You will need RDP and SSH to connect to your VMs over the network you are using, but from an endpoint perspective between vCHS and vCAC 6x, everything is over port 443.
Great and that is 443 from the vCAC to vCHS and vCHS to vCAC correct?