Error 0x6D9: Windows Firewall with Advanced Security snap-in failed to load

Some users reported that they cannot access the Internet after installing security software and Windows Firewall gave an error. In such a situation, Windows Firewall will be disabled and the system will assign the APIPA IP address. The exact error message:

“There was an error opening the Windows Firewall with Advanced Security snap-in, The Windows Firewall with Advanced Security snap-in failed to load, Restart the Windows Firewall service on the computer that you are managing, Error 0x6D9.”

Of course, if you receive such an error message, the first step is to uninstall the security software. However, this alone does not reverse the damage, so you may need to move on to the following solutions:

Perform a system restore on your computer

You can perform a system restore after uninstalling the security software. This will allow you to revert to system settings before the error occurred. Follow the instructions below:

  • Click the search icon.
  • Enter System Restore (without quotes).
  • In the System Restore section, click the System Restore button.
  • Click Apply and then OK.

After following the steps above, check if the issue is resolved.

Reset Windows Firewall

If the problem persists even after checking the Windows Firewall services, it could mean that the problem is related to the firewall configuration. In this case, you need to reset Windows Firewall. Here’s how it’s done:

  1. Open the start menu, type cmd, right click on the first result and select “Run as administrator”.
  2. Then enter the following commands one by one:
  • Reset netsh advfirewall
  • Mpsdrv clean boot
  • clean start mpssvc
  • Bfe clean start
  • regsvr32 firewallapi.dll

After that close the cmd window and see if the problem is resolved.

Run the Windows Defender troubleshooter.

The first thing to do when this error occurs is to run the Windows Defender Troubleshooter. The troubleshooter checks for firewall problems and tries to fix them. Here’s how it’s done:

  • First, get the Windows Defender Firewall troubleshooter.
  • Once downloaded, run the downloaded file.
  • Follow the prompts and wait for completion.
  • Check if this solves the problem.

Check the status of the following Windows services

If you find that System Restore did not completely fix error 0x6d9, the next solution is to check the following Windows services:

  • Windows Firewall
  • Basic Engine Filter (BFE)
  • Windows Firewall Authorization Driver (MPSDRV)

Follow the steps below to check it out:

  • Press Windows Key + R. This should open the Run dialog box.
  • Type services.msc (without quotes) and press Enter.
  • After the Service Manager window opens, find the services mentioned above and see if they are set to Started.