You should only have to set one static ip...Once your computer has one you don't need to set up another, no matter what program you are trying to port forward...
Did you follow this guide to port forwarding
Port Forwarding for the Ozenda 11g Wireless
Try using the number 64049 and remember it's the only number you enter in all 3 box's for TCP and UDP...
Could you tell me what this is the model number for AR4505GW ??