How to Fix "Connection Failed with Error Code 651" in Windows

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The "Error Code 651" in Windows typically occurs when there is a problem with your internet connection, often related to network drivers or settings. This error indicates that the connection to the network failed, usually due to issues with the Network Interface Card (NIC) or the router/modem. Here’s a step-by-step guide to troubleshoot and fix this error.
Connection Failed with Error Code 651

Understanding Error Code 651

The "Error Code 651" message usually appears when Windows cannot establish a connection to the network because it encounters a problem with a network device or driver. This can be caused by:

  • Corrupt or Outdated Network Drivers: Drivers for your network adapter may be damaged or outdated.
  • Issues with Network Hardware: Problems with your modem, router, or network adapter.
  • Network Configuration Problems: Incorrect network settings or IP conflicts.

1. Restart Your Network Equipment

Restarting your router and modem can resolve temporary connectivity issues.

  1. Power Off Your Router/Modem:

    • Turn off your router and modem. Unplug them from the power source.

  2. Wait:

    • Wait for about 30 seconds to 1 minute.

  3. Power On:

    • Plug the modem back in first and wait for it to fully power up.
    • Then plug the router back in and wait for it to fully restart.

  4. Reconnect:

    • Try reconnecting to your network to see if the issue is resolved.

2. Update Network Drivers

Outdated or corrupt network drivers can cause connection errors.

  1. Open Device Manager:

    • Right-click on the Start menu and select “Device Manager.”

  2. Update Network Adapter Drivers:

    • Expand the “Network adapters” section.
    • Right-click on your network adapter and select “Update driver.”
    • Choose “Search automatically for updated driver software.”

  3. Restart Your Computer:

    • After updating the drivers, restart your computer and check if the issue persists.

3. Reinstall Network Drivers

Reinstalling the network drivers can fix issues caused by corruption or conflicts.

  1. Open Device Manager:

    • Right-click on the Start menu and select “Device Manager.”

  2. Uninstall Network Adapter:

    • Expand the “Network adapters” section.
    • Right-click on your network adapter and select “Uninstall device.”
    • Check the option to delete the driver software if available, and click “Uninstall.”

  3. Restart Your Computer:

    • Restart your computer. Windows will automatically reinstall the network drivers.

  4. Reconnect:

    • Try connecting to your network again.

4. Check Network Configuration

Incorrect network settings can cause connection issues.

  1. Open Network Connections:

    • Press Win + R, type ncpa.cpl, and press Enter.

  2. Check Properties:

    • Right-click on your network connection and select “Properties.”

  3. Verify Settings:

    • Ensure that the settings under “Internet Protocol Version 4 (TCP/IPv4)” are set to obtain an IP address and DNS server address automatically.

  4. Reset TCP/IP Stack:

    • Open Command Prompt as Administrator by searching for “Command Prompt,” right-clicking it, and selecting “Run as administrator.”

    • Type the following command and press Enter:

      netsh int ip reset

    • Restart your computer.

5. Run Windows Network Troubleshooter

The built-in troubleshooter can help identify and fix network issues.

  1. Open Settings:

    • Press Win + I to open the Settings app.

  2. Go to Network & Internet:

    • Click on “Network & Internet.”

  3. Run Troubleshooter:

    • Select “Status” from the left menu, then click on “Network troubleshooter.”
    • Follow the on-screen instructions to diagnose and fix network issues.

6. Reset Network Settings

Resetting your network settings can resolve persistent issues.

  1. Open Settings:

    • Press Win + I to open the Settings app.

  2. Go to Network & Internet:

    • Click on “Network & Internet.”

  3. Network Reset:

    • Scroll down and click on “Network reset” at the bottom.
    • Click “Reset now” and confirm.

  4. Restart Your Computer:

    • Your computer will restart, and network settings will be reset to default.

7. Check for Windows Updates

Ensure that your Windows installation is up-to-date.

  1. Open Settings:

    • Press Win + I to open the Settings app.

  2. Go to Update & Security:

    • Click on “Update & Security.”

  3. Check for Updates:

    • Click “Check for updates” and install any available updates.

  4. Restart Your Computer:

    • Restart your computer to apply updates.

8. Check Hardware

If you suspect hardware issues, perform the following checks:

  1. Test Different Hardware:

    • If possible, test with a different network adapter or modem.

  2. Inspect Connections:

    • Ensure all cables are securely connected and not damaged.

The "Error Code 651" can be caused by issues with network drivers, hardware, or configuration. By restarting your network equipment, updating or reinstalling drivers, checking network settings, using built-in troubleshooters, and resetting network settings, you can effectively address and resolve the error. If the problem persists, consider contacting your Internet Service Provider (ISP) for further assistance or professional support.

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