Configuration for FortiGate 100F for Cisco VPN VTI behind FortiGate

[mrmadgig]

Hello

I am looking for the correct configuration for the FortiGate to allow the Cisco NAT-T 

I have once Cisco router behind the FortiGate and I cannot get the Phase 1 up keeps retransmitting and I am unsure what "passthrough" I need for the FortiGate. Cisco is connecting to another Cisco on a public IP and when I take the Cisco from out behind the FortiGate it  Tunnels up nicely. So what is blocking this in the FortiGate? Do I need to do NAT like on Cisco PAT Device in the middle? If so what is the config for this please?

So Cisco to Cisco Good to Go on Public

Cisco Public to FortiGate to Cisco private.... No dice.

Thank You in advance