•    First you need check the camera LED status.
If not, please make sure that:
-    Your router’s internet connections are working.
-    Your camera has a working Internet connection.
•    If your camera is still not working, please Reset the camera and run the install set up again.
Please refer to the below ways:
Method 1: Press the reset button on board for 10 seconds:

 
Method 2: (If you have cable harness) Press the reset button on the cable harness (It’s an optional accessory!!) for 10 seconds:

Note: Model name of cable harness: DCS-11.