Turn off DHCP in the D Link and ip Flood Detection and the Firewall in the Superhub under Content Filtering> Services, I did that and my Edimax BR6504n works perfectly.
Please login by clicking
http://192.168.0.1/ the username is admin and the password is change me, then click on the small red writing that says advanced settings then look down the left hand side and under Content Filtering> Services you untick ip Flood Detection and the Firewall.
I do know this is not Port Forwarding but it should help.