Sounds good - but we should use Port Forwarding and not Port Triggering
This looks like the perfect screen to use
With Source Ports = Any and then one of these 2 options
Either
Destination Ports = 8443 and Forward to Port = 32400 coupled with Manually Specify Port of 8443
or
Destination Ports = 32400 and Forward to Port = Same as incoming port coupled with Manually Specify Port of 32400
