Sharing Internet via Airport with Firewall on doesn't work....correctly

My imac has an ethernet hi-speed cable connection and I want to share it over the airport so that I can connect to it with my macbook and iphone.
Everything works fine, until I turn on my firewall. Once the firewall is turned on and I try to connect with my macbook or iphone, neither can get an ip address.
If I keep my firewall turned off, it shares the internet connection wonderfully and both devices get their ip's.
Does anyone know how to open the firewall up so that it allows my macbook (and such) to get an ipaddress?

They should be able to get an IP address with the firewall on or off. However they will have difficulties with other services.
The best solution is to get an inexpensive wireless router.
Another (much more complicated) option is to use WaterRoof to configure the firewall so that the appropriate ports are open on the iMac's AirPort side.

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You have not completed your profile so we cannot assist you. In your profile you will indicate critical information such as what version of OS X is installed on your computer and the computer's configuration. If you do not know how to complete your profile please click Profile Update

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If you have a Modem Router combined and an Airport Express
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If you are using 3rd party products then the set up can be a little different.
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Sharing Internet via Airport with Firewall on doesn't work....correctly

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