How to fix connection failed with error 651 in Windows

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How to fix connection failed with error 651 in Windows

Windows is a very popular operating system used widely all over the world. You might have encountered an error saying “connection failed with error 651” in Windows. In this guide, I will show you simple steps to resolve the error 651. Keep reading!

The reason behind getting Error 651?

Whenever you try to connect to the broadband, you might have bumped into error 651. This common error on windows is mainly due to the improper configuration of the modem. Other reasons include corrupted registry, conflict in IP address, misplaced sys file, the issue in network card driver, broken internet configuration. Here, I give you some basic solutions to solve Connection failed with error code 651 in Windows.

Restart your computer and modem

Before trying other solutions, first, try to restart your computer and modem. Mostly restarting will solve the problem in all the issues.

  • Shut down your computer.How to fix connection failed with error 651 in Windows
  • Turn off the modem and also unplug the connections from the power.How to fix connection failed with error 651 in Windows
  • Unplug the cables that are connecting the modem and computer.
  • Wait for 30 seconds and connect the cables between your computer and modem. Then, connect the modem to the power source. And turn it on.
  • Switch on your PC. Try connecting to broadband now and check whether you are getting error code 651 connection failed.

Reset TCP/IP to fix connection failed with error 651 in Windows

The IP address is the unique identification on the internet for your computer. If there is any conflict in the IP address, there might be error code 651 connection failed. If restarting doesn’t solve your error then, you need to reset your TCP/IP.

  • Go to Start menu and type cmd to open a command prompt.How to fix connection failed with error 651 in Windows
  • While in the command prompt, type the command netshintip reset reset.logHow to fix connection failed with error 651 in Windows
  • Restart your computer and check if the issue is resolved.

Change the dial-up connection

There are chances that your connection can be stuck or hanged during a session. At that time, you can create a new dial-up connection to solve the issue. It is necessary to create a copy for your dial-up connection to create a new connection.

  • Open Control Panel from the Start menu and go to Network & Internet ->Network &Sharing Center ->Change Adaptor Settings.How to fix connection failed with error 651 in Windows
  • You will see your dial-up connection here. Right click on it and select Create Copy option.How to fix connection failed with error 651 in Windows

Now, you have created a new connection. Delete the old one and start the new connection to check if the error 651 has resolved.

Disable IPv6 to fix connection failed with error 651 in Windows

Error 651 can be solved by disabling IPv6. This simple method has worked for numerous users.

Method 1:

  • Go to Start menu and open Control panel ->Network & Internet ->Network & Sharing Center ->Change Adaptor Settings.How to fix connection failed with error 651 in Windows
  • Right-click your connection and select the Networking tab. Uncheck the IPv6 connection option.How to fix connection failed with error 651 in Windows

Method 2:

  • Go to Control panel then Network & Internet and then Network connection.
  • Click on your connection and select Properties.How to fix connection failed with error 651 in Windows
  • Click on the Networking tab and locate Ipv6 connection. Uncheck it.How to fix connection failed with error 651 in Windows

Disable auto-tuning for Windows

Sometimes the auto-tuning feature in Windows could be crashed. If you are using a router then, disable the auto-tuning feature before an upgrade.

  • Open Start menu and enter cmd in the search box.How to fix connection failed with error 651 in Windows
  • Once in the Command Prompt, type the command: Netsh interface tcp set global autotuning=disabledHow to fix connection failed with error 651 in Windows

Now, try to connect to the internet and see whether you are getting error 651.

Clean Boot option to fix connection failed with error 651 in Windows

If there is an issue with Windows services, you can get this error. If you perform a clean boot, you can probably solve the issue.

  • Press Windows key + R and enter msconfigHow to fix connection failed with error 651 in Windows
  • On the next dialog box, go to the General tab and select Selective startup ->Load startup itemsHow to fix connection failed with error 651 in Windows
  • Now, switch to Services tab and check “Hide all Microsoft Services.”
  • Click on “Disable all” button and disable all other services.How to fix connection failed with error 651 in Windows

Restart your computer to complete clean boot. Now, connect to the internet and check if the issue is resolved.

Reinstall Network Adapter

The most recommended solution for error code 651 is to uninstall and reinstall the network adapter.

  • Open Run box by shortcut keys “Windows key + R”. Enter the command devmgmt.msc and press enter.How to fix connection failed with error 651 in Windows
  • Click on Network Adapters and expand it.
  • Locate your adapter. Right click on it and select uninstall.How to fix connection failed with error 651 in Windows

Restarting your computer will restore your network adapter. Connect to the internet and check if the error still persists.

Update Drivers to fix connection failed with error 651 in Windows

It is necessary to keep up-to-date drivers to escape error during internet connection. Go to your hardware’s website. Search driver software for your computer model and download the latest version. Install the driver and check if the error is resolved. Alternatively, you can also use third party driver updater software. This software will scan your computer and list out the outdated drivers. You can select one or choose all to update the driver. The updater software will locate the latest version of your driver and install them for you. After updating your driver, check whether error 651 still exists.How to fix connection failed with error 651 in Windows

Replace the system file

You can simply replace a system file to eradicate error 651 code.

  • The location of”Raspppse.sys” system file on Windows 7 is C:\Windows\System32\Drivers. Just go there and locate the file. Rename the file as “Raspppse1.sys”.  How to fix connection failed with error 651 in Windows
  • Download “rasppoe.sys” file from the internet. Copy it in the abovementioned location.
  • Unzip the folder and install the file.
  • Reboot your computer and check if the error has been solved.

Note: If it doesn’t work, you can delete the new sys file and rename the old one back to “rasppoe.sys” and restart the computer.

Run the Network Troubleshooter to fix connection failed with error 651 in Windows

You can use the inbuilt Network troubleshooter to solve this problem.

  • Go to Start Menu -> Control Panel.How to fix connection failed with error 651 in Windows
  • In the search box, enter “troubleshoot.” Then, select “Troubleshooting” option. Click “View All” on the left side of the screen. It will show all the troubleshooting tools.How to fix connection failed with error 651 in WindowsHow to fix connection failed with error 651 in Windows
  • Select and run the troubleshooters such as “Incoming connections”, “Internet Connections” and “Network Adapter.”How to fix connection failed with error 651 in Windows
  • Restart your computer and check if your internet is working without any error.

Here, I have listed out all the possible fixes to solve error 651. Try them and see whether the issue is resolved.

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