Expedition Navigation Software 
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Sorry Nick, I'm being lazy with my terminology!
The B&G Edge is connected to a multiport hub using the ethernet cable. The NGX-1 is connected to the multiport via the USB-A and this is connected to the laptop with a single USB-C.
In Exp, the NGX-1 uses COM3 and is set only for AIS data. The Edge uses Network 0, set for B&G Websocket. Address as per the IP address that works for the Web Interface and I checked this on the Triton displays. Port 2053. GPS is also from the B&G.
I do have a PIN set (and entered in the Exp PIN box) but I can disable this and try again.
Frustratingly, it has all worked really well since installing the Edge in the beginning of this year, and I haven't knowingly made any changes to cause this new 'challenge'!
Hopefully I've explained things a bit more clearly?
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Also, which version of Exp. If not the latest ...