Can connect via wifi but not by ethernet cable?

Hi,
I'm a bit confused here.
I have an airport express which works fine and I just bought an airport extreme.
The airport extreme is connected to the modem by an ethernet cable and the airport express is connected by ethernet cable to the airport extreme.
I am able to connect to the airport express wifi with all the computers but I'm unable to connect any computers to the airport extreme via ethernet cable.
Both airport express and extreme are lit up green and they both appear on the Airport Utility.
The airport extreme setting is set so that it is joining the airport express' network. That's the only way the light shows up green instead of flicking amber.
I've looked at the settings over and over again and am not sure/don't understand why this is? All I know is that I've got the wifi working! The ethernet connection is not workin for both PCs and Mac.
Any help is much appreciated!

The airport extreme is connected to the modem by an ethernet cable
On the WAN plug, right?
and the airport express is connected by ethernet cable to the airport extreme.
Why? You don't need AirPort Express anymore, unless you have signal weakness in your home.
If that is the case, you can use the AirPort Express to extend the range of the new AirPort Extreme WiFi network with WDS (Wireless Distribution System).
http://support.apple.com/kb/HT1515?viewlocale=en_US

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