I think the best way to do this is to put your gemfire hosts behind a firewall, and open up the ports needed for clients to connect to the locators, and servers, and the jmx port on the agent. So the ports that the firewall would have to forward are: the locator ports, cache server ports, and if you need to enable JMX connectivity to the agent, the agent rmi registry port (default: 1099).
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