Think
I bought an Airport Express yesterday to stream music from the 500-odd CDs that we have on loaded into iTunes on our Macs to the stereo in the lounge. When at first the installation refused to work (unusual for Apple – everything is usually very easy to set up), I assumed that the problem lay with my using a D-Link WLAN access point to broadcast from the computers to the lounge and started searching the web to find a how to configure this piece of non-Apple hardware, to work with the Airport Express.
After several unsuccessful hours of experimentation, I remembered I had set the D-Link access point to filter out all non-authorised WLAN clients. After I added the new hardware to its authorisation list, everything worked just fine.
As Thomas Watson said – thinking helps. (Or as Ruth always tells me: assume makes an ass out of u and me).