gimpacause

Hi All I have a HikVision DS-7608NI-SE setup with 3 Cameras, I have not had it connected to the net in a few years as all my work has been from home, I now need to monitor the site remotely, previously I had this setup with no issues, so i forwarded required ports and installed IVMS on my PC and phone I can see the NVR is Online in I?V?MS (PC & Phone) Nothing In Live View Clicking on remote configuration I can see IP Camera01 / IP Camera02 / IP Camera03 online , each have an assigned IP adress any ideas whats gone wrong every other time i have set this up it just works plugging a monitor into the NVR i can see all Camera straight away, I Know im missing something but just can1't put my finger on it, any help greatly appreciated, thank you very much -Ben