Follow these steps to troubleshoot and fix the “Network connection failed” error:

1. Check Physical Connections: Ensure all cables are securely connected to your router and modem.
2. Restart Your Device: Power off your device and turn it back on to clear temporary glitches.
3. Reboot Your Router: Unplug the router, wait for 30 seconds, and plug it back in. This can refresh your connection.
4. Check Wi-Fi Settings: Ensure that Wi-Fi is enabled on your device and that you’re connected to the correct network.
5. Forget and Reconnect to the Network: On your device, forget the network and reconnect by entering the password.
6. Run the Network Troubleshooter: Use the built-in network troubleshooter to identify and fix issues automatically.
7. Update Network Drivers: Check for and install any updates for your network drivers to ensure optimal performance.

These steps should guide you in effectively resolving the network connection error.