please check if the username and password is correct when adding the camera 2. network cable issue, please use CAT5e or CAT6e cable, It is recommended to use 8 cores for the wire, the POE cable sequence for data transmit is 1/2/3/6, for positive power is 4/5, for negative power is 7/8, the distance of cable should be controlled around 70 meters 3. camera is not powered on, please check if camera support POE