How to Fix the 0x6d9 Error in Windows Defender Firewall

Reasons for the 0x6d9 Error in Windows Defender Firewall

If the Windows Firewall service is not running or if any of the services that Windows Firewall required are not running (that is, BFE), this error message will appear. Here are 3 main reasons for the Windows Defender Firewall error Code 0x6d9.

1. Windows Firewall Configuration

Sometimes, the issue appears because of the configuration of the Windows Defender Firewall. You have to reset the configuration to fix the error.

2. Windows Firewall and Dependent Services Not Running

Windows Firewall needs to run some services to work properly. The Firewall will not work once the services are not running.

3. Malware on the System

Some malware on your system can cause this error. You can only run scans to remove the malware.

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Solutions to Fix the 0x6d9 Error

Solution 1: Perform a System Restore

First, you can try performing a System Restore. A System Restore will restore your operating system to a point in the past that can help you fix many issues.

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Solution 2: Check the Required Services

Here are the solutions to the 0x6d9 error. Just now, I mentioned one of the reasons for the error is the Windows services not running. So you need to check whether these services are running or not. Here are the steps:

Step 1: Open the Run dialog box by pressing the Windows + R keys at the same time.

Step 2: Type services.msc and press Enter to open the Services window.

Step 3: Then you need to search for Windows Defender Firewall and Base Filtering Engine one by one to check whether these services are running or not.

Additionally, you need to set their Startup type to Automatic. Please double-click the service to open the Properties window and choose Automatic that is in front of Startup type. Then you can see if the issue persists.

Solution 3: Reset Windows Firewall

If the issue still exists, the Windows Firewall configuration is causing the problem. Then you need to reset Windows Firewall. Here are the steps:

Step 1: Open the Start Menu, type cmd and search for it. Then select Run as an Administrator.

Step 2: Then, you need to type the following commands one by one:

netsh advfirewall reset

net start mpsdrv

net start mpssvc

net start bfe

regsvr32 firewallapi.dll

Solution 4: Reset the Permissions for Microsoft Protection

Then, you can try this solution – reset the permission for Microsoft protection. But if you modify it incorrectly, the registry file may be corrupted, which will cause a bigger problem for your computer. Therefore, be sure to back up the registry before performing the following steps, read this post – How to Back up Individual Registry Keys Windows 10?

Here are the steps to fix the 0x6d9 error in Windows Defender Firewall:

Step 1: Press the Windows +R keys to open the Run dialog box. Then type regedit and press Enter.

Step 2: Navigate to the following registry keys one by one.

1. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Epoch

2. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Defaults\FirewallPolicy

3. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy

Step 3: Right-click (Default), choose Modify and input the value data: NT SERVICE \ mpssvc. And you should input the value data to the above registry keys.

Step 4: At last, restart your computer.

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Final Words

When you see this error message, do not panic. You can try the solutions one by one that I mentioned in this post. I hope your computer can keep secure and safe, meanwhile, I hope these solutions can help you fix the 0x6d9 error in Windows Defender Firewall.