Azure AppGateway same port cant be used on both private and public IP
Currently we have an app gateway deployed, we have several listeners that are on a private IP address, (for internal users) the plan was to also make these sites available on an external IP on the same app gateway.
However it appears once a port has been assigned in a listener, it can not be assigned to another listener with a different front end port.
A ticket was raised with MS ref: :118062518450635.
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Jeff Miles commented
This would be a really nice feature. I know the standard answer is "use an internal Load Balancer for your private connection" but that just adds another layer of complexity, not to mention requires consideration for outbound SNAT rules.