Unable to access internet via Airport Express

Hi. I'm have trouble connecting to the internet using my Airport Express.
When I plug in my DSL modem to the unit, I get the solid green light. My Macbook is able to connect to the airport, and to other computers on the same Airport.
However, none of my computers are able to reach any internet sites. They were even unable to directly ping a remote IP address. However, if I plug my DSL modem directly into my Macbook, bypassing the Airport, it correctly connects to the internet, which leads me to believe the problem is with my Airport.
A couple of oddities which I don't know if they are normal. First, in my MacBook's network prefs, the DNS box is blank. However, I'm connected via DHCP, so I didn't know if that'd matter. In the airport configuration app, under internet, it's also using DHCP, but the box is empty, with the same address as the router (192.168.1.1) greyed out next to it. The IP address is 192.168.1.5. This number is rather different than when I connect to my DSL router directly on my MacBook.
I'm running what I believe to be the newest firmware (6.3).
Any ideas anyone?
Thanks,
Nathaniel

Hi,
I solved the problem using the airport express firmware 6.1.1. and erasing all favourites networks in network pref panel to create new ones. You may also check the keychains utility (applications -> utilities). If there is several times the same pass, just keep the latest and erase the others.
Hope my english is understandable...

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