LaserGRBL and Nighthawk connection

Hi everyone,

I'm new to CNC and am trying out my QB2/Nighthawk with LaserGRBL but can't seem to connect. There software shows a status of "connecting" for a few seconds then switches to "disconnected". As you can see from the screenshot, it is recognising that the Nighthawk is there.

Same problem connecting with Wifi (Telnet). I wonder if anyone can help me?

Many thanks

Warwick