If you are trying to view your cameras on your NVR system Live View and you are seeing a No Network Host error message, this is an indication that the IP address of the cameras you have added to your NVR have changed. This error message can occur with cameras connected over a Power over Ethernet (PoE) switch. If you are connecting your cameras to a PoE switch and you have a power outage or network concern this may result in your camera(s) IP address changing.
Avoid this error message by configuring the IP address of your camera to a Dynamic Host Configuration Protocol (DHCP) Reservation. Once you have configured the IP address of your camera(s) with a DHCP Reservation, you will need to do a Device Search, delete the old IP address and add the new IP address(s) for the cameras.