firewall/webcam

[tthen]

I have a logitech quickcam 4000 connected to asus wl-500g, firmware 1.9.2.7. working great from lan/wlan. From wan it's working when firewall is deactivated. do anyone knows what settings i have to do to make the camera work from wan, when firewall is activated?

[tthen]

i have tried these settings:
enable virtual server list: portforward port 7776 to 192.168.1.1, not working!
enbble virtual dmz to ip 192.168.1.1, not working.

get this message: "couldn't connect to server"

is there any other port to forward?