What version of the ARM software are you running. I had some issues on my system prior to installing v1.04, especially with the rebranded Dell units.

You also might want to check the IP configuration (if you havne't done so) under ARM software to make sure the correct adapter is selected.

fyi, I was never able to consistently make the HPNA card work in my system in conjunction with an ethernet card installed and active in my Windows XP system. I tired using the Windows XP software to bridge the HPNA and Ethernet cards, but it never seemed to click. I resorted to using my router (which has HPNA capability) to bridge the ethernet out of my computer to the phone lines in my house.