1)What is the make and model number of the NVR ?
2)What is the make and model number of the camera ?
3) Did you try to configure the camera using a PC or MAC ?
4)Is the camera connected to the NVR via a POE ethernet connector on the NVR ?
If 4 is yes
A) Did you plug the camera into one of the connectors on the NVR then move it to another Connector ?
B) have you tries to do a hardreset on the camera then plug it into then NVR
if 4 is no
a) If camera is not plugged into the NVR provided a network diagram, Manufacture/model, include modems, switchers, routers.....