You the man broIf you not can connect with USB either - it not only is a IP adress problem. The USB connection do not use TCP/IP - it is a serial connection.
Connect your laptop to the Doser with USB, Start GCC. Open administration. There you should Have your Doser with a RS232 connection. You should see a com port (blue). Go to device manager (red) Klick.
Open device manager - look for port (COM LPT) (red) . Check if it shows the same port both in device manager and administration of the Doser. If not - change the port in the doser to the one in device manager
If it not work now (with USB connection) - open a support ticket with GHL