Upon connecting to the Internet, your browser displays the following error message:
Server not found
Firefox can't find the server at xxxxx.com Here's how to solve this issue.
Check the connections
First, make sure all cables are properly connected:
Ethernet cable (if you are not using Wi-Fi).
Network connection and configuration
You have to check if the problem is only related to your web browser or if it is due to the network configuration.
Click Start > Run > type cmd
Enter ping www.google.com and confirm with Enter
If the answer looks like this, then it means that you are connected to the internet, otherwise there you will need to check your network configuration
The Firewall is blocking your connection
The Firewall is blocking access to the internet. Try to disable your firewall and connect to the internet again. If you are unable to disable the firewall feature or don't know how to disable it, boot your PC in Safe mode.
Restart the computer
Repeatedly press the "F8 " key to display the "Advanced startup" menu.
Select Safe Mode.
Try to connect to the internet.
If it works, then your problem may be due to a misconfigured firewall or malicious software blocking the access to the internet.