I was asking about webserver ports which has load-balancer plugin installed. The webserver http listener should be running on port 80 and https listener should be running on port 443.
As you mentioned, back-end instances can run on any ports. This will available to webserver(load-balancer) through loadbalancer.xml. This information is not available to the users/clients. The users/clients will send request to webserver, which in-turn will send request to back-end instances using appropriate listener.
Thanks,
Kshitiz
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