What's wrong with the computer suddenly not being able to access the Internet?

The reason why the computer suddenly cannot access the Internet may be network connection problems, IP address conflicts, DNS problems, firewall settings, network configuration problems, network driver problems, virus or malware infection, network service provider problems, etc. . Detailed introduction: 1. Network connection problem. First, check whether the computer's network connection is normal. You can check the physical connection of the network connection to ensure that the network cable or Wi-Fi connection is properly connected to the computer. If you are using a wireless network, please ensure that the computer is connected to the computer. The connection of the wireless router is stable and the signal strength is good; 2. IP address conflict, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

The sudden inability of the computer to access the Internet may be caused by a variety of reasons. The following will introduce some common possible causes and solutions.

1. Network connection problem: First check whether the computer’s network connection is normal. You can check the physical connection of the network connection to ensure that the network cable or Wi-Fi connection is properly connected to the computer. If you are using a wireless network, make sure the connection between the computer and the wireless router is stable and the signal strength is good.

Solution: Replug and unplug the network cable or reconnect to Wi-Fi to ensure a stable connection. If other devices can access the Internet normally, you can try restarting the router or adjusting the wireless channel.

2. IP address conflict: IP address conflict means that multiple devices use the same IP address on the same network, resulting in network conflict and the inability to connect to the Internet.

Solution: In the Windows operating system, you can open the command prompt and enter the "ipconfig /release" and "ipconfig /renew" commands to release and update the IP address. In Mac operating systems, you can open network settings, select the TCP/IP tab, and click "Use DHCP" to automatically obtain an IP address.

3. DNS problem: DNS (Domain Name System) is a system that converts domain names into IP addresses. If there is a problem with the DNS server, the computer may not be able to resolve the domain name and may not be able to access the Internet.

Solution: You can try changing the DNS server settings of your computer. In the Windows operating system, you can open the network connection properties, select the TCP/IP protocol, and manually set the preferred DNS server. In Mac OS, you can open Network Settings, select Advanced Options, and add a new DNS server in the DNS tab.

4. Firewall settings: Firewall is software used to protect computer security, but sometimes it may block network connections, making it impossible to access the Internet.

Solution: Check your computer's firewall settings to make sure network connections are allowed. You can try turning off the firewall or adding appropriate exception rules to allow network connections.

5. Network configuration problems: Sometimes the network configuration file may be damaged or incorrect, causing the computer to be unable to connect to the network correctly.

Solution: In the Windows operating system, you can open the command prompt and enter the "netsh int ip reset" and "netsh winsock reset" commands to reset the network configuration. In Mac OS, network profiles can be deleted and the network connection reconfigured.

6. Network driver problem: The network driver is the key to normal communication between the network adapter and the operating system. If your network driver is damaged, outdated, or not installed correctly, you may be unable to access the Internet.

Solution: You can try to update or reinstall the network adapter driver. You can check the status and driver version of your network adapter through Device Manager (in Windows) or System Preferences (in Mac).

7. Virus or malware infection: Certain viruses or malware may interfere with network connections and prevent you from accessing the Internet.

Solution: Run anti-virus software for a full system scan to remove any potential viruses or malware. Make sure your antivirus software and operating system are up to date and updated and scanned regularly.

8. Internet Service Provider (ISP) problems: Sometimes, the Internet service provider may have network failure or maintenance, resulting in inability to access the Internet.

Solution: You can contact the network service provider to inquire about whether there is a network failure or maintenance work, and to obtain further support and solutions.

It should be noted that the above solutions are only common solutions in general situations. The specific situation may vary depending on the device, operating system and network environment. If the above methods cannot solve the problem, it is recommended to consult network technical support personnel or contact the network service provider for more detailed help and support.

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