How to Fix Error 651 in Windows 10

In Windows, error codes are extensive and broad, and they can simultaneously occur in various locations in a system. Moreover, the information about each code are not specific and demands extensive analysis and investigation. Errors in internet connection is one of the most frequent problems experienced by Windows users and here, we are talking about “Error 651”.

“Error 651: The modem has reported an error”. It is one of the most frequent problem faced by Windows users that occurs when broadband device fails to connect to the internet. But before jumping for the solutions to how to fix error 651 in Windows, we must understand that what causes the error.

What causes Error 651 in Windows 10?Error 651 in Windows 10

Error 651 occurs when Window users tries to connect to the internet using PPPoE connections. However, if your modem is reporting an error, the reasons can be endless. The most common factors are

  • Faulty configuration of modem
  • Missing system files
  • Conflict in IP addresses
  • sys file saved in wrong location
  • Registry errors
  • Frequent crashing of Program
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Best Ways to Fix Error 651 In Windows 10

“Connection failed with error 651”. There is no sure-shot way to fix the error, but you can try some troubleshooting methods to deal with the problem.

Uninstall the Recent Windows Updates

Did you update your Windows recently? Are you encountering issues after recent updates? Certain update packs conflicts with the operating system and causes Error 651. If the problem is occurring due to recent Windows update, then you must remove or uninstall those updates.

Step 1. Go to the settings or use Windows shortcuts key Win + I to directly jump to settings.

Step 2. Click Update & security menu.

Step 3. Tap the Windows Update tab

Step 4. Now click the Update history.

Step 5. Take some time to check the recent updates and figure out the problem that is causing error 651

installed updates

Reset Dial-Up Connection

Your modem or broadband connection might be facing issues. Reason can be many and but resetting connection might solve the problem. How? Follow the steps.

Step 1. Go to the Settings.

Step 2. Click the Network & Internet menu.

Step 3. Tap Dial-up tab

Step 4. Go to the Broadband Connection.

Step 5. Jump to the Advanced options button.

Step 6. Switch on Automatically detect settings.

Step 7. Restart the computer.Reset Dial-Up Connection

Update the Modem Driver or Network Driver

It is possible that your modem is outdated or not compatible with the system. This might be causing network connection problem including error 651. So, check the website of manufacturer’s website for downloading and installing drivers to fix error 651.

Reset TCP/IP

In order to reset the TCP/IP, you can use a command line and deal with the Error 651 on Windows 10.

Step 1. Go to Command Prompt (Admin).

Step 3. Type “netsh int ip reset reset.log” in the Command Prompt.

Step 4. Hit Enter.

Step 5. Reboot and restart the PC.

Reset TCP-IP

Deactivate Auto Tuning Feature

Auto Tuning feature of Windows is responsible for augmenting the performance of Windows programs that collect TCP data from any network. Deactivating or disabling auto-tuning feature can do wonders if you are using a router. Follow the steps below for disabling the auto-tuning feature of Windows.

Step 1: Open “Command prompt” with administrative rights.

Step 2: Copy and paste the given command into the command prompt: Netsh interface tcp set global autotuning=disabled

Step 3: First, disconnect and then reconnect the internet

Disconnect IPv6 of Internet Connection 

To fix error 651, simply disable IPv6 of the Internet connection by following the guide below.

Step 1: Go to Control Panel and search Network & Internet.

Step 2:  In Network & Internet, select Network & Sharing Center.

Step 3:  Just tap your active network connection, dis-select Internet Protocol version 6 and click Ok.

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Re-registration of “raspppoe.sys” File

It is possible that error 651 is occurring due to “raspppoe.sys” file, which is not loading while connecting to the internet. You can fix this problem by registering the raspppoe.sys file again.

Step1: Go to “Command Prompt” with administrative rights.

Step 2: Copy and paste the given command to the “Command Prompt”: regsvr32 raspppoe.sys

So, these are some tips and tricks that can help you fix Error 651 in Windows and connect to the internet. If nothing works, just restart the PC for the simple reboot or restart the modem especially if you have first time received this error.

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