Or is the user name and password wrong? Still wrong? (Unknown errors are usually POE).
The next step is to fix it according to the error: the network is unreachable, you should delete all channels first, and then refresh to see if there is any IP added, that is, there is a+sign in front. If not, there are three possibilities: the network cable is not connected well, the power supply is not connected well, or the camera is broken, but Haikang's camera will not be broken easily.
For other errors, you need to find a computer, connect the hard disk video recorder with a network cable, and then SADP will debug it to see when the IP network segment and the video recorder are consistent. I used to debug this thing remotely for others.