Port Forwarding between two gateways

[ppssysadmin]

I am trying to redirect a UDP stream between two external interfaces but without much luck. It appears that the firewall rules created are not appropriate when going between gateways. I did create a static route to push the destination to/from the correct gateway but I don't think it is getting that far. The firewall rules seem to be incorrect given the movement between two WANs
Does this have to be managed manually due to the WAN to WAN vs WAN to LAN?

[ppssysadmin]

@ppssysadmin This WAN port is also behind a larger NAT could that be causing the 'Block traffic from port 0 (1000000114)' errors I am seeing in the log?

[ppssysadmin]

@ppssysadmin Client had a sport=0 on the udp messages. problem found!

[johnpoz]

What would of been creating a source port 0 traffic? That is borked!