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We all know the situation: You’re surfing the net on your Windows computer or are about to connect to the internet, but the already-established connection gets interrupted or the computer fails to connect to the targeted connection.

One connection error that’s common on Windows 11 is the Error 651. Fortunately, it’s only a minor error, and you can easily troubleshoot it on your own. In this post, we’ll show you 5 effective ways to fix “Connection Failed with Error 651” on Windows 11.

Error Message

Error 651 appears in a pop-up window when you’re surfing the Internet or are about to connect. The exact text may vary a bit, but the error message always has the following text:

How to troubleshoot Error 651?

Before we proceed with the solutions, check whether the system or connection is to blame.

Test connectivity on another device or try a different connection

The first thing you need to do is determine if the issue is related to your computer, service provider, or modem.

If another device can connect on the same Wi-Fi network, you can safely assume the issue is system-related. On the other hand, if no other device can connect to your Wi-Fi network, the error is due to the router, modem, or service provider.

The other way to determine whether the Error 651 is system-related or not is to connect your Windows computer to another Wi-Fi network that you know is working fine. If the computer is not able to connect, the problem is system-related. Otherwise, the connection is the guilty party. If your system is to blame, try the solutions listed below in the order they appear.

Solution #1 – Run Network Troubleshooter

Network Troubleshooter is a built-in tool in Windows computers that scans and help fix common network connectivity issues.

Here’s how you can run the Windows Network Troubleshooter:

• Type settings in the Search bar in the taskbar and hit Enter

• Click System in the right-side panel
• Scroll down and click Troubleshoot in the right-side panel

• Click Other troubleshooters

• Look for Network and Internet entry in the right-side panel and then click the Run option next to it

• Now the Troubleshooter window will open
• Choose Troubleshoot my connection to the internet
• If the Troubleshooter finds any issue, click Apply this fix
• If it doesn’t find any problem, choose Close the troubleshooter and move on the next solution

Solution #2 – Reset TCP/IP

In case there’s an issue with TCP/IP settings, then also you can encounter the Error 651.

Here’s what you need to do:

• Type command prompt in the Search bar, right-click Command Prompt in the search results, and select Run as administrator

• Type the following command in Command Prompt and then hit Enter

• Once this command has been executed, restart Windows, and check if the problem is resolved

Solution #3 – Disable IPv6

Some users have reported that disabling IPv6 worked for them, so giving it a shot is worth it. Since most connections do not require IPv6, disabling it will not impact your computer’s connectivity performance.

Follow these steps to disable IPv6 on Windows 11:

• Click Win + R keys
• Type ncpa.pl in the Run dialog box and hit Enter

• In the Network Connections window, right-click your network adapter and select Properties

• Scroll down inside the “This connection uses the following items” section, and uncheck Internet Protocol Version 6 (TCP/IPv6) and click OK

Now, try connecting your computer to the targeted connection and check if it’s working fine.

Solution #4 – Update your network drivers

For your computer to effectively communicate with a network and access the internet, you need up-to-date network drivers. If your network drivers aren’t up-to-date, you can encounter Error 651 and other connectivity-related issues.

Here’s how you can update the network drivers:

• Type devmgmt.msc in the Search bar in the taskbar and hit Enter

• Locate and expand Network adapters entry in the Device Manager window
• Right-click the wireless adapter and select Update driver

• Select the first option in the next window: Search automatically for drivers

• Windows will scan the system to locate the latest network driver. If it finds an updated version, it will automatically install it

The other way to manually update the network driver is to go to the network adapter manufacturer’s website and search for the latest driver for your network adapter model. However, before you visit the manufacturer’s website, you’ll need to know the driver version that’s installed on your computer. To do so, follow these steps:

• Open Device Manager and expand the Network adapters section
• Right-click your network adapter and select Properties

• Click the Driver tab and note down the driver version

If the manufacturer has released a new driver version, download it and save the file in a suitable location. Once the download is complete, double-click the driver installation file (it will have .exe file extension) and follow on-screen instructions.

After installation is complete, restart your computer and check if the issue is fixed. If not, try the next solution.

Just a quick word before you move on the next solution: Updating drivers manually can be tedious. Therefore, we recommend using a third-party tool such as Driver Updater. The beauty of this tool is that it automatically updates all outdated drivers with a single click in just a few minutes. Read the last section of the post to find out more about this amazing tool.

Solution #5 – Reset network settings

If none of the above solutions has worked for you, we recommend resetting the network settings as the last resort.

Here’s what you need to do:

• Type settings in the Search bar in the taskbar and hit Enter
• Click Network & Internet in the left-hand panel

• Select Advanced network settings in the right-side panel

• Click Network Reset in the More Settings section in the right-side pane

• Select Reset now

• Windows will reset the network adapter and then restart

After Windows reboots, you should be able to connect to the internet.

Why use Driver Updater to update device drivers?

Driver Updater is among the best third-party tools for updating device drivers automatically. It is super-fast, reliable, and accurate.

Automatic driver update tools offer many benefits, the most important ones being:

• You can update device drivers automatically
• The software scans and updates all outdated or missing drivers at one go
• The tool picks the right drivers for your device and operating system, so you won’t have to worry about installing an incorrect driver by mistake
• Automatic driver updates are 100% safe

Driver Updater is one of the best driver update tools out there. Outbyte Driver Updater will give you access to a database of over 1 million drivers. It will regularly scan your PC, suggesting new driver versions to install. Driver Updater contains drivers for a variety of Windows devices. With just one click, you can update drivers in your system.

Step 1
Click here to Install and launch the app

Step 2
Scan all devices

Step 3
Install or update drivers automatically

 

Start Download

 

Connection failed with error 651 occurs when Windows faces some problem while establishing network connections. It is one of the common Windows errors that can be resolved easily. If you are frequently getting error 651 while using your Windows computer, try the solutions given here to resolve connectivity problems.

What is Connection Failed with Error 651?

The connection failed with error 651 is mostly related to PPPoE (Point to Point Protocol over Ethernet) connection; your dialup Broadband connection. There can be several reasons for this error such as wrong internet connection settings or IP configuration or faulty network drivers.

It would be difficult to know the exact cause of the error but the solutions given here have helped users to resolve the connectivity issue successfully. We have given five solutions in this post but you may not be required to try all solutions.

Start with the first solution and work your way downwards until the connectivity issue gets fixed.

Solution One- Restart your PC and modem

Many times the error 651 is temporary and occurs because the internet connection with the computer is not established in the right manner in the first attempt. You can resolve this by restarting PC and modem which will force the computer and modem to re-establish the internet connection. Here are the steps to follow.

• Turn off your Windows PC after saving work and closing all programs
• Turn off the modem and unplug its power cord from the electrical socket
• Remove all connections between modem and computer
• Wait for 30 seconds and plug the power chord of the modem into an electrical socket
• Plug-in all connections between modem and computer in right manner
• Power on the PC and wait for some time until everything is running normally. For example, your Windows has successfully booted and the modem seems to work fine.
• Now try dialing the broadband connection and see if the internet connection with your ISP server is established. If the error persists, try next solution

Solution Two- Update Network Drivers

You can get this error when your network device drivers are either corrupt or outdated. Updating the network drivers will help resolve the issue.

You can update drivers manually through the Device Manager window. However, you’ll need to have some time on your hands for this as the process is time-consuming. But that is not the biggest problem. Even after spending time and effort, you might not be able to download the correct drivers.

Automatic driver update tools offer many benefits, the most important ones being:

• You can update device drivers automatically
• The software scans and updates all outdated or missing drivers at one go
• The tool picks the right drivers for your device and operating system, so you won’t have to worry about installing an incorrect driver by mistake
• Automatic driver updates are 100% safe

Driver Updater is one of the best driver update tools out there. Outbyte Driver Updater will give you access to a database of over 1 million drivers. It will regularly scan your PC, suggesting new driver versions to install. Driver Updater contains drivers for a variety of Windows devices. With just one click, you can update drivers in your system.

Step 1
Click here to Install and launch the app

Step 2
Scan all devices

Step 3
Install or update drivers automatically

 

Start Download

 

Solution Three – Making changes to settings in Networking and Sharing center

Majority of the network problems arise due to wrong network settings. Many users were able to resolve the error 651 after disabling IPv6 for Internet connections. IPv6 is an advanced protocol used to connect websites but many ISPs have a difficult time working with IPv6 addresses leading to several internet connectivity problems at the user end.

You can see if the error 651 can be resolved by disabling IPv6 in your network connections. Here are the steps to follow.

Disable IPv6 for your Internet connection

• Right-click on the network icon in the system tray(bottom-right corner of the screen) and click Open Network and Sharing Center

• In the Network and Sharing Center window, click Change adapter settings

• Right-click on your Network connection and click Properties

• Uncheck the box next to Internet Protocol Version 6 (TCP/IPv6)

• Click OK to save changes and close the properties window

Try reconnecting to the network to see if the error 651 issue is resolved. If the error still persists, perform next troubleshooting steps given below.

Create a new dial-up connection

There is a possibility the existing dial-up connection existing has some wrong settings or configuration. To ensure there is no problem with the dial-up connection, you can create a new dial-up connection to sort out any issues with existing dial-up connection. Here are the steps to follow.

• Right-click on the network icon in the bottom-right corner of the screen and click Open Network and Sharing Center

• In the Network and Sharing Center window, click Change adapter settings
• Right-click on your Network connection and click Create Copy

• Now, right-click on original dial-up connection and click Delete

• Use the newly created dial-up connection to connect to Internet and see if the issue is resolved. If the issue persists, try next solution

This step is provided for users who have been using router between modem and computer to connect to ISP. To resolve any internet connectivity errors, you need to directly connect your computer to modem. In that case, you need to create a new dial-up connection following the steps given below.

• Plug in the Ethernet cable in LAN port of your computer
• Right-click on the network icon in bottom-right corner of the screen and click Open Network and Sharing Center

• In the Network and Sharing Center window, click Set up a new connection or network

• Select Connect to the Internet in the connection wizard and click Next

• Click Set up a new connection anyway

• In the next window, click Broadband (PPPoE)

• In the next window, enter user name and password given by your ISP and click Connect

If the internet connection is established, the error 651 is resolved. If you still get the error 651, try next solution.

Solution Four – Reset TCP/IP settings

TCP/IP settings on your computer are important. TCP/IP stands for Transmission Control Protocol/Internet Protocol which is an important communication protocol used by networks to communicate with each other.

TCP defines how the data packets travel over the network. If there is any problem in TCP/IP settings, your computer would not be able to establish a network connection with your ISP server resulting in error 651. Resetting TCP/IP could resolve the issue. Here are the steps to follow.

• Click Start and type cmd in Cortana search box
• Right-click command prompt in search results and click Run as administrator
• In the User Account Control pop-up, click Yes
• In the command prompt window, type the following command and hit Enter on the keyboard

• After the command is executed successfully, close the command prompt window and restart your PC

Try connecting to the Internet and see if the issue is resolved. If you still get error 651, try next solution

Solution Five – Disable the auto-tuning feature

Windows has an auto-tuning feature that enhances the performance of the application that receives TCP data over the network. In some cases, the auto-tuning feature may reduce the data transfer rates or also lead to loss of connectivity.

The auto-tuning feature could be the reason behind error 651. To rule out this possibility, disable the auto-tuning feature and see if it helps. Here are the steps to follow.

• Click Start and type cmd in the search box
• Right-click command prompt in search results and click Run as administrator
• In the User Account Control pop-up, click Yes
• In the command prompt window, type Netsh interface tcp set global autotuning=disabled and press Enter on the keyboard

• Wait for the command to execute successfully.
• Close the command prompt window and restart your PC

Try connecting to the Internet and see if the issue is resolved. In most cases, the error 651 should be resolved now.