Here are the steps you can follow to troubleshoot the “Error: Network connection failed” message:

1. Check Your Device: Ensure that your device’s Wi-Fi is turned on and airplane mode is off.
2. Restart Your Device: A simple restart can often resolve connectivity issues.
3. Examine Router and Modem: Ensure they are plugged in and powered on. Look for warning lights.
4. Reconnect to Wi-Fi: Forget the network on your device and reconnect by entering the password.
5. Use Ethernet Cable: If available, connect your device directly to the router using an Ethernet cable to test the connection.
6. Restart Your Router: Unplug your router, wait for a minute, then plug it back in.
7. Check for Service Outages: Visit your ISP’s website or call their customer support to see if there are any outages in your area.
8. Update Network Drivers: For computers, ensure that your network drivers are up to date.
9. Run Network Troubleshooter: On Windows, you can run the built-in network troubleshooter for more detailed diagnostics.
10. Reset Network Settings: As a last resort, reset your network settings on your device to factory defaults. Be cautious as this will erase saved networks and passwords.

Following these steps should help you identify and resolve the network connection issue effectively.