Error 651 is a Windows bug that prevents the user from accessing the internet. The failure can happen on Wi-Fi or wired networks, usually on computers that upgraded from Windows 7 to Windows 10. When the problem occurs, the PC usually displays the message the connection has failed.
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The cause may be related to multiple factors, ranging from network driver errors to the wrong configuration of the machine's IP address, making it difficult for the modem or router to work. Despite the uncertain reason, the solution to the problem can be simple. See below how to resolve error 651 to reestablish the web connection on the PC.
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How to enable Wi-Fi on your notebook
Use the Windows correction tool
The Windows native patch wizard may be the simplest way to resolve error 651 on your computer. The tool can identify bugs in the system on its own, suggesting or applying solutions automatically.
Step 1. Open the Start menu and search for Troubleshooting to open the list of wizards;
Access the Windows troubleshooting wizard Photo: Reproduo / Paulo Alves
Step 2. Under Internet Connections, click Run troubleshooting. Wait for the tool to finish working to find an automatic solution;
Make Windows search for solutions automatically Photo: Reproduo / Paulo Alves
Adjust the network adapter
Step 1. In some cases, a simple deactivation and later reactivation of the computer's network adapter can solve the connection problem. To do this, start by accessing the Device Manager through a Windows search;
Access the Windows Device Manager Photo: Reproduo / Paulo Alves
Step 2. If there is a triangle on one of the icons below Network adapters, click on the problematic item with the right mouse button and select Disable device. Then, repeat the procedure to enable again;
Disable the network adapter Photo: Reproduo / Paulo Alves
Step 3. If you disable and re-enable the resolver, try updating the network adapter manually. Right-click on the items that contain the terms wireless and ethernet, selecting Update driver;
Update your computer's network drivers Photo: Reproduo / Paulo Alves
If the error persists, it is worth checking that your computer is not incorrectly configured to use IPv6 on an IPv4 network. Such problems are common when the PC is used in different connections, at home and at work. The solution, in this case, is to disable the IPv6 connection.
Step 1. Access the Windows settings;
Access the Windows settings Photo: Reproduction / Paulo Alves
Step 2. Access the Network and Internet option;
Access the computer's network settings Photo: Reproduo / Paulo Alves
Step 3. In the Ethernet menu, click on Network and Sharing Center;
Access the Network and Sharing Center Photo: Reproduo / Paulo Alves
Step 4. Click on the network you are trying to reestablish connection to and access the properties;
Access the connection properties Photo: Reproduo / Paulo Alves
Step 5. Scroll the screen and uncheck the box next to IP protocol verse 6. Click Ok to finish.
Disable IPv6 Photo: Reproduo / Paulo Alves
If disabling IPv6 does not work, a reset to the full protocol settings can help resolve connection problems caused by IP conflict.
Step 1. Type cmd in the Windows search to find the Command Prompt. Right-click and select Run as administrator;
Open CMD as an administrator Photo: Reproduo / Paulo Alves
Step 2. Type the command "netsh int ip reset reset.log", without the quotes, and press Enter. Restart the computer in sequence to check if the fault has been resolved:
Restart TCP / IP Photo: Reproduction / Paulo Alves
AutoTuning is a feature that aims to improve the performance of programs that depend on TCP, but the tool can interfere with the computer's connectivity on the network in some cases. To disable the function, open the Command Prompt again as an administrator and enter the command below. After pressing Enter, test your connection again.
Disable the Autotuning feature to resolve the error 651 on Windows Photo: Reproduo / Paulo Alves