My Lab topology is show as below:

I create 2 NAT rule :

When translate on client side is check, I can revived web portal. fw monitor show as below:

When translate on client side is uncheck, fw monitor show as below:

but O is not current, it should be eth0, show I add routing as below:

fw monitor:

now it looks current interface, but still can't received web portal.
so I add web server second IP 10.8.2.80. and it is work. I can received web portal. fw monitor is show as below

In my lab, is it connection or route issue with access web portal even I add route?
or this is current configuration for this lab (translate on server side) ?