How can I resolve the failure to activate a network connection in Linux?

If the Linux network connection fails to activate, you can try the following troubleshooting methods:

1. Check the network hardware: Make sure the ethernet cables, Wi-Fi adapters, or other network hardware are connected correctly and working properly.
2. Check the network configuration by using the command ifconfig or ip addr to inspect the configuration of the network interface. Make sure the interface is configured properly, including the IP address, subnet mask, gateway, etc.
3. Restart networking services by using the command “sudo systemctl restart network” or “sudo service networking restart” to attempt to resolve any possible service issues.
4. Check DNS settings: use the command cat /etc/resolv.conf to verify the DNS server configuration. Make sure the IP address of the DNS server is correct and accessible.
5. Check the firewall configuration: Use the command sudo iptables -L or sudo ufw status to check the firewall configuration and make sure that the necessary ports for network connections are not blocked.
6. Check the routing configuration: Use the command “route -n” to check the routing table. Make sure that the destination addresses for network connections can be accessed through the correct gateway.
7. Check the network service: Use the command sudo systemctl status network or sudo service networking status to check the running status and error messages of the network service. Make the necessary repairs based on the error messages.

If the above methods don’t solve the issue, you can try restarting your computer or reinstalling the network driver. If the problem persists, you may need to consult a network administrator or seek further technical support.