Open SDK connect app on N9, select USB and connect the cable. You'll see your IP address that you don't like.

Now click settings below and disable DHCP server so you can change the IP to the one that you like.

I'm not sure this will help you at all, but you can try.
I think your USB device (N9) is virtually attached to the wrong virtualmachine, or maybe even to the host. You must virtually disconnect N9 from current machine and connect it virtually to the VM that has QTSDK. You do that by clicking the icons AFAIR.