Unable to connect to Internet via Airport Express - 'cannot contact server'

I'm unable to connect to the internet via my Airport Express. I'm using OS 10.3.9, and had the same setup with no problems at a previous address, but with a different modem from the same ISP.
My AE is connected - the light is green - and my mac is connected to the network in Internet Connect. But when I open Safari I get an 'unable to contact server' message.
I've tried rebooting everything (modem, AE, Mac), and leaving modem/AE off for several minutes. Also reset the AE, but to no avail.
The connection works fine via Ethernet cable.
Any ideas?

Thanks, I checked out that advice doc (106798), but could not connect to the address ( which is given to test if it's a DNS issue. My ISP says I shouldn't need DNS settings.
The service is PPPoE, and I went into Airport Admin Utility to check if the Airport was configured for this. Under Configure/Internet, I found it was set to 'Ethernet', so changed it to PPPoE. Then when I restarted I got connection status in the bar (and good Airport signal), but status flipped between 'looking for PPPoE host' and 'negotiating PPPoE host', sometimes sticking on one or the other each time I tried rebooting all gear.
Any other ideas?

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