No Connection to the cable modem/Internet with APX

Hi!
My Apple Airport Express BaseStation worked properly for some weeks - but from one day to the other, the ethernet connection to the cable modem doesn't work anymore. The cable modem is working properly, there is NO problem. I can connec to the internet vial LAN card of the computer without problems. But my APX has no connection to the cable modem. The flashlight is blinking orange.
I tried everything - hard reset, soft reset,..... but no change, there is no connectin to the cable modem.
Does anybody know what to do? Can the APX be defect?
regards,
flo

I found the solution: somehow an old and inactive dhcp-server and dns-server setting messed around with the settings. Once I deleted these settings everything started working normally again

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