Thanks for the reply, i gave up since i did 1 day debugging with this and tried what you said too. In the end I cleared all iptable rules that came with ipfire…and added 1 forward rule and 1 masquerade one to get it to work.
@linken I followed the wiki page; worked on my test ipfire. The only difference I see in your screenshot is the Protocol should be set to TCP and Dest port to 80 where in your screenshot you have Protocol preset. That might be the issue.