Below are the logs collected from the primary gateway of my firewall. In "O" the source IP is getting NATed to the NAT IP and then pre-encrypt is shown and not receiving the POST-encrpt packet.The other end firewall is not observing any traffic.
[vs_0][fw_2] eth1:i[60]: 10.140.96.6 -> 10.232.144.14 (TCP) len=60 id=42611
TCP: 40768 -> 515 .S.... seq=24587d9c ack=00000000
[vs_0][fw_2] eth1:I[60]: 10.140.96.6 -> 10.232.144.14 (TCP) len=60 id=42611
TCP: 40768 -> 515 .S.... seq=24587d9c ack=00000000
[vs_0][fw_2] eth0:o[60]: 10.140.96.6 -> 10.232.144.14 (TCP) len=60 id=42611
TCP: 40768 -> 515 .S.... seq=24587d9c ack=00000000
[vs_0][fw_2] eth0:O[60]: 10.40.112.6 -> 10.232.144.14 (TCP) len=60 id=42611
TCP: 40768 -> 515 .S.... seq=24587d9c ack=00000000
[vs_0][fw_2] eth0:e[60]: 10.40.112.6 -> 10.232.144.14 (TCP) len=60 id=42611
TCP: 40768 -> 515 .S.... seq=24587d9c ack=00000000