The cause of the problem: Generally speaking, the cause is that camera can not access the Internet (Camera cannot connect to internet), Please check whether the wireless router which the camera connected to is working properly. Make sure that you can access the internet when connected to the WiFi of the router. Suggestions: If the router is working fine, then please check the following information: 1. Check LAN connection. If you can view the camera in PC client, Phone APP and Web client, that means the LAN connection is fine. If you can’t view the camera in LAN, then we can’t view it in WAN. 2. If the camera can be viewed in LAN, please switch to mobile network, check whether the camera can be viewed normally. 3. If the camera cannot be viewed in mobile network, then please change a router to test again. 4. If the camera still can’t go online remotely after changing router, then it must be a problem of the camera’s PNP penetration. It is recommended that take the camera to other network environment to have a try, for example, your friend’s network. 5. If can view the camera normally in other network environment, that means there is a problem with the local penetration of the camera. Then we can not use the UID to access. In this case, please contact the dealer for help. Note: 1. Please make sure the camera get the latest firmware and the APP is the latest one. If not, please update the firmware and APP to the latest version 2. Generally speaking, the issue that the camera can be connected and viewed in LAN, but can not in WAN is cause by software or server, instead of hardware problem, no need to return to factory for repair.