I just forwards the ports I needed to the IP of what needed the ports opened, then tested it from the internet side(from LAN side it will show router config or nothing happens), and it worked fine.
Just bought the WZR-HP-G300NH and I'm also trying to port forward my ftp running on my nas.
I too have this problem (from LAN side it will show router config or nothing happens).
Works fine with my replaced linksys g router but not this new router.
Port forwarding seems to stop at the router and not accessing to my ftp.
Any help here?