Portforwarding UDP 500 and 4500 Ports to a Device behind a Fartigate

Hello,

on a FG 60D with Firmware v5.2.4,build688 i must forward the VPN Ports (UDP 500 and 4500) to a Device behind the Fortigate.

WAN with PPPoE --> Fortigate --> Sophos XG SFOS 18.04. Alle other ports i forward to the Sophos XG Firewall a working, only the VPN does not. I try to disable VPN, remove all old VPN Connections. My background an Fortigate is nerly 0

Have someone a tip for me?

thx in Advance