Port Forwarding

Hi Community, 

I have sophos XG 125. I have a biometrics server behind this sophos which my biometric device in another location needs to communicate with. The biometric device is configured with a

live/routable IP, The biometric server has local IP. How can I configure port forwarding on this biometric device IP to the biometric server. The Sophos IP and the biometric device IP are

provided by different ISP. Please I need help.