Follow these detailed steps to troubleshoot the “Error: Network connection failed. Please check your internet connection” message:

1. Check Your Modem and Router: Ensure that both devices are powered on and that the lights indicate normal operation.
2. Inspect Connections: Make sure all cables are firmly connected to the modem, router, and your device.
3. Restart Devices: Power cycle your modem and router by unplugging them for about 30 seconds, then plugging them back in.
4. Connect via Ethernet: If you’re using Wi-Fi, connect your device directly to the router using an Ethernet cable to see if the issue persists.
5. Check Network Settings: On your device, navigate to the network settings to ensure you are connected to the correct Wi-Fi network and that airplane mode is off.
6. Forget the Network: On your device, forget the Wi-Fi network and reconnect by entering the password again.
7. Run Network Troubleshooter: If you are using Windows, run the built-in network troubleshooter to diagnose and fix issues automatically.
8. Update Network Drivers: Ensure your network adapter drivers are up-to-date, as outdated drivers can cause connectivity problems.
9. Reset Network Settings: As a last resort, reset your network settings to factory defaults. Be aware that this may require you to re-enter your Wi-Fi passwords.
10. Contact Your Internet Service Provider: If all else fails, reach out to your ISP for assistance, as the issue may be on their end.

By following these steps, you can systematically address the error and hopefully restore your internet connection.