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Interesting idea with a reverse proxy. You were right the issue was the additional NAT rule.
Somewhat misleading that it is under the "Outgoing NAT" section when sometimes it applies to incoming like in this case.
I was able to get it to work by changing the source net from WAN net to any.
Thanks for the tips

Hi - Have a straightforward setup where I am already port forwarding in from the opnsense WAN interface to servers private IP's behind the LAN connections on port 443. When opnsense gets a connection on the WAN it port forwards it to the internal server and the internal server see the original public source IP.
 
The caveat is the private ip server behind the LAN have a different default gateway from the opnsense device

How can I configure source nat on the inbound port forward so that when opensense forwards the connection to the internal server, it changes the source ip to be the opnsense LAN IP as the source ip? I understand this means that when it port forwards connections to the internal servers all of them will see the opnsense LAN IP as the source ip. That is what is wanted so the internal servers default gateway is not a factor

I tried to configure a rule under the "NAT-Outbound" section like this:
Interface: Lan
Source: WAN net
Destination: Server private ip
Destination Port: 443
NAT address: Lan address
Nat Port: *

but it doesnt seem to work.

Appreciate any assistance