DS-7716NI-I4 problem since upgrade to NVR.4.... i think or maybe the change of ISP

Hi

I'm having issues with my DS-7716NI-I4.

My Platform Access/Register Status is showing as Offline and I cant get it to change to Online no matter what I try.
I have spent five hours today going over the settings, I'm missing something silly I think.

to make things worse I'm not sure if it has been a problem since the NVR upgraded to NVR.4 or when I changed ISP to SKY from BT.

Any help appreciated