Are you sharing a Single IP on your Airport?
If you are do this (from Apple's help menu): Quote:
Enabling the NAT Port Mapping Protocol
In the Finder, choose Utilities from the Go menu.
Open Airport Admin Utility.
In the resulting Select Base Station window, select your Airport Extreme or AirPort Express from the list.
Click Configure, then enter the base station password when prompted.
Click the Base Station Options button.
Select the Enable NAT Port Mapping Protocol checkbox.
Click OK.
Click the Update button and wait for the base station to restart.
After your Airport Extreme or AirPort Express restarts, NAT-PMP will be enabled.
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