1. The network device camera is not connected to the nimax system. Please confirm whether the network device camera is connected to the nimax system, and check whether the connection is normal.

2. The IP address or port number of the network equipment camera is set incorrectly. Please confirm whether the IP address and port number of the network device camera are set correctly and are consistent with those in the nimax system.

3. The network device camera is faulty or damaged. Please check whether the network device camera works normally, and there is no fault or damage.