Hi,
If you want to use the Tobii Rex as TCP/IP device on Windows, an additional driver is required.
Tobii IS Drivers 1.3.5 – for USB TCP/IP – http://developer.tobii.com/?wpdmdl=18
If you still experience connection issues, please contact our support as they will need to provide you with different files: http://www.tobii.com/eyex-support
Cheers,
Konstantin