First make sure you have the 2.0 driver for MacOS X isntalled. The firmwire version is fine if it is B.9. Also make sure your ENET/100 is on the same subnet with your computer, if the ENET/100 is not recognized by your computer, you are not going to be able to use IBIC commands on it. Check the LEDs on your ENET box and make sure none of them are red when trying to talk to the device. It looks like you never had the ENET/100 recognized correctly, check the IP address you are using for the ENET box has no conflict with other hardware.