Network abnormal issue - struggling here

I have 3 Hilook POE cameras, one of which is not in use (forgot the password!), and an 8-port POE NVR. I plugged one, never used camera into the NVR and just worked out of the box. The third camera (IPC-D120) is currently being recorded via the Linux ‘motion’ package and has been for a year or so now. In this setup the camera is plugged into a POE switch as is the Linux server and all works fine.

I want to plug this third camera into the NVR but am failing badly. No matter what I try the...

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