AE Lost Internet Connection through Cable Modem

I suddenly lost all internet connectivity. Here's the setup and issues:
-- Two computers, a Mini and a PowerBook, both lost connection to Internet
-- Motorola cable modem (using Comcast)
-- Airport Express is connected to modem via ethernet
-- I can connect directly to the cable modem with the computer via ethernet and I can get internet service; also, Comcast assured me I still have service
-- The two computers can connect to each other via airport; file sharing, iTunes streaming, etc., works as usual
-- I've done all the usual "unplug everything and restart" routines
-- Nothing was changed recently that I can think of - it just lost connection to the Internet.
Any ideas?
PowerBook G4 17 1.67GHz 1.5Gb Mac OS X (10.4.6)

I fixed it, but I don't know if it will solve the problem Ada had. I got a note from Comcast recently saying I needed to have my IP settings to be dynamic, by using DHCP. I had already made that change so didn't suspect that was the problem. However, after looking closely, I found some things to change.
If you're using Comcast, or a similar service, then this may fix it:
I first went out and washed my car, then came back in. I think that's an important step. I have a large car, so if yours is small, you may need to wash it twice, or wash it then wax it. Then go back inside and . . .
In Airport Admin Utility, select your base station, then Configure.
Switch to the Internet tab.
Make sure it's set to Configure using DHCP
Make sure DNS Servers, Domain Name, and DHCP Client ID are left blank (this is the step I hadn't done before).
Click Update and close the program and wait for your base station to reset.
This should fix it.

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This almost always indicates your firewall or anti-virus utilities are preventing iTunes from contacting the iTunes Store. Here is an exerpt from "Can't connect to the iTunes Store": http://support.apple.com/kb/TS1368
Troubleshooting on Windows
If you haven't been able to connect to the iTunes Store for more than a day —and other customers on our discussion boards aren't experiencing similar issues— a software or internet service provider (ISP) configuration issue may be blocking your access to the iTunes Store. Click here to find out which ports and servers need to be allowed for iTunes Store access.
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If you have not done so already, try the steps in iTunes for Windows: iTunes Store connection troubleshootingto troubleshoot iTunes Store connectivity in Windows.
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Windows XP: If you've upgraded to Windows XP Service Pack 2: By default, Windows Firewall is enabled. As with all firewalls not manufactured by Apple, you will need to configure Windows Firewall to allow iTunes to access the iTunes Store. To do so, see How to enable iTunes in the Windows XP Firewall.
Windows Vista and 7: As with all firewalls not manufactured by Apple, you will need to configure Windows Firewall to allow iTunes to access the iTunes Store. To do so see, the "Blocked by software firewall" section in this article.
Proxies can cause issues and should be avoided whenever possible. To disable the proxy built-in to Windows see, iTunes for Windows Can't access the Internet if proxy settings are incorrect.
If you are receiving a specific error message you may want to see, the "Specific Conditions and Alert Messages" section in this article as needed.
If the issue still persists, contact your internet service provider and confirm that the ports and servers in this article are enabled over your network.
The "hosts" file may be blocking the iTunes Store
Microsoft's article How do I reset the hosts file back to the default? has instructions and a "FixIt" to have Windows try to reset the hosts defaults for you.
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To create a copy of your hosts file and replace it with an empty hosts file, follow the instructions for your operating system below.

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When I've asked my ISP why I am getting disconnected, they said if all 4 lights of the modem are steady (and the yellow one flickering), which they always have been when I've been disconnected, then it isn't the modem or them. They have good tech support and I trust them.
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...And now it all of a sudden works. However, as I can't delete this post I hope others who have had similar problems may have solutions for future issues.

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Message was edited by: pbranda

Let's double-check your Mac's Internet Sharing settings ...
To setup for Internet Sharing (Wired to Wireless):
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AE Lost Internet Connection through Cable Modem

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