The "No internet, secured" error on Windows 10/11 devices indicates an issue with the internet connection despite being connected to a secure wireless network. Some possible causes include VPN settings, IP configuration issues, outdated drivers, or problems with the network adapter. Various solutions include disabling VPN, refreshing the IP configuration, resetting Winsock, checking network adapter properties, disabling IPv6, modifying DNS server settings, updating network device drivers, running the Network Troubleshooter, and restarting the router.