Remember that RMMLite will ONLY work with ethernet. If you are plugging the karma into your macintosh with a USB cable, it won't work.

Troubleshooting ethernet with the Karma is a lot like troubleshooting ethernet with the car player, so see if any of those troubleshooting steps help you.

Note that RMMlite will also only be useful for sending songs h to the Karma. Other features, such as updating the firmware, I think will require a Windows computer and a USB cable.