If a user is unable to access the Internet through a Wi-Fi connection then there may be two cases due to which the issue has occurred. The first case is when the IP address of your internet is invalid i.e 0.0.0.0. The second case is when the IP address of your Internet is valid but not the public IP address. The internet IP address becomes invalid when the physical or wireless connection between the devices is improper. To resolve the Internet IP address problem, a user can visit the interface of the tplinkwifi.net window and can change the LAN IP address of their router.