Cannot access certain web sites through Airport Extreme Base Station

I use the old (round) Airport Extreme Base Station (AEBS). Approximately three weeks ago I could no longer connect to americanexpress.com or to Godaddy or their mail servers. About a week ago the Godaddy sites started working again, but the American Express sites are still not working.
My current setup:
- AEBS connected to Time Warner New York cable modem
- Three Airport Express units - two connected to speakers, and one set up with WDS to provide Ethernet access to computer (PowerMac G5), which is in a separate room from cable modem
- I also have an Airport card in my G5 to connect directly to the wireless network (but that doesn't solve any of my problems)
I have tried resetting all the units, and have also tried running the network with all the Airport Express units turned off, none of which as allowed me to access American Express.
I have the exact same problems with my work-issued Windows 2000 laptop when logged in to the wireless network.
When I plug a computer directly in to the cable modem, I have no problem accessing any of the sites, which leads me to believe that the solution somehow lies with the AEBS - I just can't figure out what it is.
Any help/suggestions are much appreciated.
PowerMac G5, 23" Cinema Display, Airport Extreme Base Station (802.11b/g)   Mac OS X (10.4.9)  

If you're having trouble with throughput performance or just connecting to some websites, try changing the MTU value, on your Mac, to 1492. (The default value is 1500.) To do so, you can use a utility, like Cocktail or via OS X's Terminal.
MTU will vary with connection type. Cable and non-PPPoE, can use up to 1500, whereas PPPoE connections (WinPoet, RASPPPOE, Enternet, etc.) can only use up to 1492. For secure VPN connections (i.e., IPSec) use a MTU value less than 1500.
The best value for MTU is that value just before the packets get fragmented. To test, use the Ping utility.
OS X: ping -D -s 1472 www.dslreports.com
WinXP: ping -f -l 1472 www.dslreports.com
Reduce 1472 by 10 until you no longer get the “packet needs to be fragmented” error message. Then increase by 1 until you are 1 less from getting the same error message. Add 28 more to this (since your ping packet size, not including IP/ICMP header is 28 bytes). This will be your MaxMTU. (Note: If you can ping thru at 1472, stop, you’re done! Add 28 and your MaxMTU is 1500.)

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