Firewall Access Rules
If you access ESXi hosts through vCenter Server, you typically protect vCenter Server using a firewall. This firewall provides basic protection for your network.
A firewall might lie between the clients and vCenter Server. Alternatively, vCenter Server and the clients can be behind the firewall, depending on your deployment. The main point is to ensure that a firewall is present at what you consider to be an entry point for the system.
ESXi Security Guide
Please see Pages 23-25 for extra Port Information
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