Just a note erasing all my settings in Internet Prefs and starting over with Internet Connection Wizard I have same issue. I could not even get on with the settings it made... but typed AmigaX5K in the hostname field... saved and it then connected me. Used iBrowser fine.... Rebooted X5K and the card goes limp again... same as before... limp by saying the light on the card during boot is steady green but once workbench loads, the card light goes dim green and I have zero connection again. As if the card on boot or load of workbench loses connection. Only way to get back is to switch Internet Prefs to static, save, let it fail connection and time out... switch back to DHCP, save, and normally it then connects and light comes back on. Use it... reboot... gone again.
I sense the card has issues unless there is some underlying issue in the software.
TJ