Connection Failed With Error 651: Incredible Hacks

You may encounter the error 651 when you try to connect to the Internet using a broadband connection. It’s considered as one of Windows’s most common errors. There are many reasons behind the issue. If your modem is not properly configured, then you face the glitch. There are many other reasons also. The missing sys file, corrupted registry, the confliction between the IP addresses, or the broken internet configuration is the most responsible reason for this error.

Sometimes, users can resolve this particular error in a moment, but it is not the same scene every time. In case you are also confronting with the same issue, then read the entire article and get the proper solutions related to the problem.

Smart Ways To Solve The Connection Failed With Error 651

Here are some of the incredible ideas by which you can solve the glitch instantly. Hence, you need to go through the procedure and find the most perfect one for you.

Solution One: Repair The Registry Key

Seldom, a wrong or corrupt registry key is responsible for this particular error. But there are certain ways to resolve it. To do so, at first, go to the Home screen. Then tap on the “Start” option and type “Advanced Startup Options.” Choose the “Advanced Startup Options” that appears in the search box. You can see a general settings screen will open. You have to spot “Advanced Startup” on the right side of your screen. Tap on the option “Restart now.” The computer starts to restart in the advanced startup mode. Choose the Troubleshoot icon and tap on the “Advanced Options”. Next click on the option “Automatic Repair.” The computer starts to Reboot. Choose the administrative account. Automatic repair tool will now detect and adjust any malicious approaches in the registry. If the process completes successfully, then the error may be resolved.

Solution Two: Update Your Network Card Driver

Driver updates for Windows 10 and many devices (such as network adapters, monitors, printers, and video cards) are automatically downloaded and installed through Windows Update. It’s probably you already have the most current driver, but if you’re having trouble with a device, you can try fixing it by updating or reinstalling the driver. Here’s how:

  • Go to the Windows main screen and select the Start button, type Device Manager in the search bar area on the Start menu. Press the Enter key on the keyboard to select it from the list of results.
  • Expand a category (like Monitors or Network Adapters) to find the name of your device, then right-click on (or tap and hold) it, and select the option Update Driver. For example, to update a network driver, expand the Display adapters section, now right click on the network, and select the option Update Driver.
  • Left click on the option “Search automatically’ for updated driver software.
  • If Windows doesn’t find a new driver, you can try looking for one on the device manufacturer’s website and follow their instructions.

In case these steps don’t work, try reinstalling the driver:

  • Open the Device Manager, right-click on (or tap and hold) the name of the device, and left click on the Uninstall option. Restart your computer device, and Windows will attempt to reinstall the driver.

Solution Three: Manually Reset TCP/IP

To manually reset TCP/IP, follow these steps:

On the Start screen, type “CMD”. From the search results, choose Command Prompt by right-clicking on it, and then select the option “Run as administrator.”

Under the Command Prompt section, enter the following command, and then tap on the Enter key.

netsh int ip reset c:\resetlog.txt.

Instead of finding a specific a directory path for the log file, you can run the following command.

netsh int ip reset.

C:\WINDOWS\system32>nbtstat -R

Successful purge and preload of the NBT Remote Cache Name Table.

C:\WINDOWS\system32>nbtstat -RR

The NetBIOS names registered by this computer have been refreshed.


Restart the computer.

Solution Four: Update The Windows Version

Sometimes, the system error may arise due to an old outdated version of the Windows Operating System. So, you should try to update your Windows version and check if the issue solve. The updating process will discuss below.

At, first go to the Windows main screen and left click on the Start menu. Now again left click on the Start menu’s Search bar and type Setting and hit the Enter key on the keyboard to open the setting window. Otherwise, you can also go to the Setting window by clicking to the Setting icon, which is located in the notification section.

After entering the Setting window, left click on the Update and security option. Now a new window will open on your screen. Left click on the Check for the update to see if there have any available update. If you see any suitable update for your Windows version, then click on the download option. When the download is completed, install the latest version of the Windows. Once the entire process is completed, reboot your device to run all the new changes smoothly.

Solution Five: Disable The Auto-tuning Feature

Left click on the Windows Start menu option and then left click on the Search bar. Now type cmd in the search bar and hit the Enter key to open the Command Prompt window. You can also right click on the option and select Run as administrator option to open the window as an administrator.

Now copy the given command below and past it in the Command Prompt window.

Netsh interface tcp set global autotuning=disabled

After all the command completed, try your Internet connection again to see if it works.

Solution Six: By Restoring The System

If the previous methods are not helpful for you, then go through this method. Try using the system restore method by following the steps:

  • Go to the Home screen of your device.
  • Then click on the Start option and type in the search box “System Restore”.
  • Next, choose “System Restore” from the results list.
  • A new window will open in your computer. Go through the instruction displayed on the screen.

The restore process will start now. After completing the process, restart your computer and check if the error 651 still occurs or not.

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