1,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