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NAT based on source port

Hello, 

 

On my old UTM 9 I had a NAT rule:

Source IP: Any

source port: 17478

protocol: udp

Destination Port: 1024-65535

Destination IP: Sophos WAN

Forward to: Internal Server on IP 192.168.x.9

 

It's a certain application which works.. strange.

 

Session is initiated by a client to the server which I want to run.

The client does this by contacting the server on port 17478 with a random source port.

The server then opens a session with the client, also with destination port 17478 which the client uses to communicate.

 

At this moment opening the session outbound to the client works.. but the replies from the client are being blocked by my XG

How would I create such a forward to allow this traffic though the Sophos XG? Is it possible?

Kind regards,

Frank



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