Express unable to connect to Extreme when wireless security enabled

I have an Airport Extreme base station enabled as a WDS and communicating with an Airport Express which all works great to connect wirelessly to the internet and to play iTunes music on my stereo. The problem is that whenever I enable wireless security on the base station in an attempt to set up and maintain a private connection, the Express blinks amber, cannot recognize the network set up by the base station, and fails to work with iTunes. When I disable wireless security, it goes back to working again. I've tried re-enabling WDS and all kinds of other things, but to no avail. I'm thinking that somehow the Express must be authorized to communicate with the base station, but I don't know exactly how to do this, and the documentation from Apple is not clear on this. Can someone advise? Thanks.

The reason the Airport Express loses its connection is that it doesn't know the password.
You have two ways of doing this.
1. When adding security to a WDS network, add it to the remote nodes first then turning them off, before adding it to the main base station and turning the nodes back on.
2. Hard/Factory reset the Airport Express nodes and then reconfigure the main base station before then configuring the reset Airport Express units.
Resetting AirPort Express
http://docs.info.apple.com/article.html?artnum=108044
iFelix

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