I had the same problem, I have 4 camera connect on NVR
In NVR GUI it already show D1 to D8 with IP: 192.168.254.2 to 192.168.254.9
but it still show Offline(User password error.) for all D1 to D8.
When I try to change ip D1, D2, D3, D4 to other IP it was detected camera with active mode, with...