How to Fix Error 651 in Windows (6 Best Methods 2019)

If you see “error 651” message on your PC, there is no need for you to worry as this is a very common error faced by windows users. This error happens when you try to connect to the internet using PPPoE connections. There are numerous reasons that lead to this error and you must know How to Fix Error 651 in Windows.

Following are some of the reasons causing error 651 in Windows:

  • Rasppoe.sys file have been saved in the wrong location
  • Registry error
  • IP address conflict

Because of all the above reasons, the message reading “error 651- the modem or another connecting device has reported an error”. This message will be titled as “connection failed with error 651”.

Now that we have understood the error and the reasons causing the error let us start looking into solutions to Fix Error 651 in Windows. Let me mention that there is no “official” method of fixing this error. However, there is much trouble shooting methods which have been used by Windows users across the globe to fix the issue.

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How to Fix Error 651 in Windows ?

Unplug the Router and Plug It In Again


The basic troubleshooting method to Fix Error 651 in Windows is to reconnect your connection. If you are utilizing a router, switch it off and turn it on after few seconds. This might sound really stupid and useless, but surprisingly, this simple solution fixes the error 90% of the time.

Reset TCP/IP on your computer

For resetting your network stack on windows perform the following steps:

  1. Launch command prompt (windows + R)
  2. Type in ‘netsh int ip reset reset.log ‘ and press enter.

This will reset your networking stack. Restart the computer.

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Recreate New Dial-Up

Sometimes, error 651 might occur because the network gets hanged while trying to connect to the network. This problem can be solved by recreating a new dial up and deleting the old one.

For recreating new dial-up follow these steps:

  1. Open network and sharing center.
  2. Click on change adapter settings.
  3. Right click on the broadband connection.
  4. Click on create a copy.
  5. Delete the old connection and redial using the new connection.

Disable Auto Tuning Feature

Windows uses auto tuning feature for continually monitoring the routing conditions. Routing conditions include conditions such as bandwidth, network delay, application delay, etc. This helps in maximizing the performance of the network. But sometimes this might also lead to error 651. Disabling this feature will Fix Error 651 in Windows for your PC especially if you are using a router.

For Disabling auto tuning, follow these steps:

  1. Run command prompt ( Windows + R)
  2. Type the following- Netsh interface TCP set global autotuning=disabled; press enter.
  3. Restart the computer.

Disable IPv6 of your Internet Connection

IPv6 is the next generation internet protocol. It was made for replacing the earlier IP version that is IPv5. Disabling IPv6 from the internet connection of your PC might help to Fix Error 651 in Windows.

Follow these steps for disabling IPv6:

  1. Go to control panel.
  2. Select network and the internet.
  3. Click on active internet connection.
  4. Select Properties.
  5. Switch to networking tab.
  6. Untick IPv6 and click OK.

Reinstall the Network Adapter

Reinstalling the network adapter has fixed the error 651 for many people. Once you restart your computer after uninstalling the network adapter, it re-installs the network adapter automatically. So all you really have to do is uninstall the network adapter and restart the PC. Installing process will be done by Windows on its own.

For uninstalling network adapter, follow these steps:

Device Manager
Device Manager
  1. Search for devmgmt.msc. In start.
  2. Double click to launch device manager.
  3. Look for network adapters category.
  4. Click on the ‘+’ icon.
  5. Right click on the first network adapter
  6. Click uninstall.
  7. Restart your computer after this process.

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These were some common troubleshooting methods to Fix Error 651 in Windows. I hope these methods helped you to fix error 651 on your computer. These are the most common troubleshooting methods used by thousands of people across the world to fix error 651. There are also other errors that might occur, like you might also need to solve error 924, etc. Even after trying all the above-mentioned methods your internet connection is not fixed, contact your internet provider and report the problem. Chances might be that the problem is from their side and not your computers.

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