Problems sharing internet over Airport extreme

I have a PowerBook G4 (OS 10.4.11) with a USB wireless broadband modem connected to the internet. I bought each of my daughters a MacBook (OS 10.5), and the idea was for me to have my laptop connected to the internet, then use internet sharing via my airport extreme card so that the girls could access the internet from my connection across airport.
I have no problem using my wireless broadband to connect to the internet. I have no problem firing up my airport extreme and creating the network, and I have no problem creating the internet share. I all seems to be working at my end. On the girls MacBooks, we have no problem firing up airport and connecting to the airport network I created. However, when we fire up safari, all we get it "you are not connected to the internet".
I'm lost. Any ideas?

cdelahoy, Welcome to the discussion area!
On your PowerBook G4 do you have the firewall enabled? If so, try go to System Preferences-> Sharing preference pane and enabling Personal Web Sharing. That should open the ports needed to give Internet access to the MacBooks.
If that doesn't work, try disabling the firewall on the PowerBook G4.

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