AWS Fortigate S2S directionality issue...

Hello,

Suggest checking the troubleshooting steps listed in the below Knowledge center article:

https://aws.amazon.com/premiumsupport/knowledge-center/vpn-cgw-vpg-traffic/

When I see this is says to me "NAT is happening in the Fortigate firewall". Make sure that you've disabling any address translation on the VPN connection or for the IP ranges in question.

The other common issue is that the AWS side is not configured to initiate the VPN connection which means it must be created from the Fortigate side. Our documentation talks to how to configure tunnel initiation: https://docs.aws.amazon.com/vpn/latest/s2svpn/initiate-vpn-tunnels.html

hello, review the rule of security group in the interface to internet. this could be have allow trafic explicity. I was have something like that.

best regards