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Error Code 0x6d9 In Windows 11/10? How To Fix

It cannot be overstated how important the internet is to our lives. Antivirus software protects us from the perils of the internet. It makes our online activities safe and free from any unwanted dangers. But what if you, like many users, get Windows Firewall error 0x6d9?

Windows Firewall Error Code 0x6d9 Causes

Several Windows users have encountered this error, some of which are mentioned below.

1 – Upon installing additional security software, users encountered an error.

2 – The error code 0x6d9 is returned by the Windows Firewall when it crashes for no apparent cause.

3 – Many users needed help accessing the internet while running Windows Defender.

Whether you’re using Windows 10 or Windows 11, here are various solutions to the issue.

Error Code 0x6d9 In Windows 11/10? How To Fix

Restart Windows Security

A quick restart will sometimes fix the issue. Thus, before going any further steps, restart the Windows Security service. Below are the necessary steps.

1 – Search for Windows Security in the search bar.

2 – Click Open. 

3 – Click the Restart now button on the Virus & threat protection section.


Reset Settings For Windows Firewall

Resetting Windows Firewall has been a successful fix for many users. We have also mentioned the Command Prompt instructions for this.

1 – Type cmd into the Windows search box and click Run as administrator on the right.

2 – When the Command Prompt window appears, type the below commands separated by Enter.

netsh advfirewall reset

net start mpsdrv

net start mpssvc

net start bfe

regsvr32 firewallapi.dll

Perform System Restore


To begin, thoroughly uninstall the security software. By that, we mean uninstalling the software without leaving any traces. A System Restore may be necessary after completing those steps. You can restore your PC to a time when everything was operating normally. Only after creating a restore point will you be able to run a System Restore. This article explains how to use System Restore in Windows 10/11.

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Scan System Files

Corrupt Windows Firewall system files may be the culprit of Windows Firewall error 0x6d9 system. Use Command Prompt to scan and restore corrupt System Files.

1 – Type cmd into the Windows search box and click Run as administrator on the right.

2 – Type sfc /scannow and hit Enter when the Command Prompt window appears.

Check whether you can fix the issue after the scan is complete.

Check Required Services

If services connected to Windows Firewall are not operating as they should, the Windows Firewall error code 0x6d9 may occur. Below are the steps to resolve this issue.

1 – Start the Run command by pressing Windows + R.

2 – Type services.msc in the dialogue box and hit Enter.

3 – When the “Services” box appears, scroll down and double-click Windows Defender Firewall.

4 – Pick Automatic as the startup type.

Also, check the Base Filtering Engine and Network Store Interface Service (BFE).

Close Conflicting Program

When, for instance, you’ve installed an app that is interfering with the operation of your PC, run time errors such as the one in issue occasionally occur. The best course of action is to uninstall the app. Before that, you may launch Windows in Safe Mode with a restricted set of drivers and files and then check to see whether you can run the Windows Security service correctly. If so, this suggests that a recently installed program is the culprit. You can exit the program or uninstall it by returning to regular mode. Below are the steps to “End Task” any background programs.

1 – Launch the Task Manager by pressing ctrl + shift + esc.

2 – Choose the program which is creating issues. 

3 – Select the End Task.


We trust that your Windows Firewall is operating normally at this time and that you are no longer seeing error code 0x6d9. Please let us know which solutions worked for you in the comments below.

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