Error 651: How to troubleshoot network connection problem

Error 651 is a Windows bug that prevents the user from accessing the internet. Failure can happen on Wi-Fi or wired networks, usually on computers that have upgraded from Windows 7 to Windows 10. When the problem occurs, the PC usually displays the "connection failed" message.

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The cause may be related to multiple factors, ranging from network driver errors to misconfiguration in the machine's IP address, making it difficult for the modem or router to work. Despite the uncertain motive, solving the problem can be simple. Here's how to resolve error 651 to reestablish the web connection on the PC.

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Enabling Notebook Wi-Fi

Use the Windows fix tool

The native Windows hotfix wizard may be the simplest way to resolve the 651 error 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

Step 2. Under "Internet Connections, " click "Run Troubleshooting." Wait for the tool to finish working to find an automatic solution;

Get Windows to search for solutions automatically

Adjust the network adapter

Step 1. In some cases, a simple deactivation and subsequent reactivation of the computer's network adapter may resolve the connection problem. To do this, start by accessing the Device Manager through a Windows search;

Access the Windows Device Manager

Step 2. If there are any triangles 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

Step 3. If disable and re-enable does not resolve, try to update 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

Check IPv6

If the error persists, check to see if your computer is not configured incorrectly to use IPv6 over an IPv4 network. Type problems are common when the PC is used on 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 Windows Settings

Step 2. Access the Network and Internet option;

Access your computer's network settings

Step 3. In the "Ethernet" menu, click "Network and Sharing Center";

Access the Network and Sharing Center

Step 4. Click on the network that you are trying to reestablish connection and access the properties;

Access the connection properties

Step 5. Scroll down the screen and uncheck the box next to "IP Protocol Version 6". Click "Ok" to finish.

Disable IPv6

Restart TCP / IP

If deactivation of 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 Windows Search to find the Command Prompt. Right-click and select "Run as administrator";

Open CMD as administrator

Step 2. Enter the command "netsh int ip reset reset.log", without the quotation marks, and press Enter. Restart the computer in sequence to check if the fault has been resolved:

Restart TCP / IP

Disable autotuning

AutoTuning is a feature that is intended to improve the performance of TCP-dependent programs, but the tool may interfere with the computer's connectivity to the network in some cases. To disable the function, open the Command Prompt again as administrator and enter the command below. After typing Enter, retry your connection.

Turn off the Autotuning feature to resolve the 651 error in Windows

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