Airport Ext. Port Forwarding does not work

I am trying to open up UDP ports 500, 1701, and 4500 to point to my local computer since i'm using iVPN. However, Airport doesn't seem to want to open these up. I disabled Mobile Me as per the support document I found and still having issues.
I want to be able to VPN via my iPhone and/or MacBook Pro into my home network.
My Mac Mini is running 10.6.5 with all the latest updates. My Airport Ext has the Wireless N with latest updates as well.
Any help appreciated. I have spent over 2 hours searching on google and could not find any documents that actually got this to work.

To setup port mapping on an 802.11n AirPort Extreme Base Station (AEBSn), either connect to the AEBSn's wireless network or temporarily connect directly, using an Ethernet cable, to one of the LAN port of the AEBSn, and then use the AirPort Utility, in Manual Setup, to make these settings:
1. Reserve a DHCP-provided IP address for the iVPN device.
Internet > DHCP tab
o On the DHCP tab, click the "+" (Add) button to enter DHCP Reservations.
o Description: <enter the desired description of the host device>
o Reserve address by: MAC Address
o Click Continue.
o MAC Address: <enter the MAC (what Apple calls Ethernet ID if you are using wired or AirPort ID if wireless) hardware address of the iVPN host computer>
o IPv4 Address: <enter the desired IP address>
o Click Done.
2. Setup Port Mapping on the AEBSn.
Advanced > Port Mapping tab
o Click the "+" (Add) button
o Service: <ignore this for now; it will change to Custom once you start entering values>
o Public UDP Port(s): 500, 1701, 4500
o Public TCP Port(s): 1723
o Private IP Address: <enter the DHCP-Reserved IP address you created earlier>
o Private UDP Port(s): 500, 1701, 4500
o Private TCP Port(s): 1723
o Click "Continue"

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