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Unable to Activate Windows Defender Firewall – How to Fix – iSumsoft

One of the most important built-in features of Windows 10 is the Windows Defender Firewall, which is designed to help prevent hackers or malicious software from gaining access to your PC through the Internet or a network. If you don’t keep it running, that means your computer could potentially be in danger every time you connect to the Internet or other networks. Therefore, it is recommended to have it turned on constantly.

But lately, many Windows 10 users have been having trouble activating the Windows Defender Firewall. If you don’t get your Windows Defender Firewall activated right away on your system, this will prevent it from keeping your operating system protected online. Fortunately, there are 5 simple but effective ways to help you fix Unable to Activate Windows Defender Firewall issue as soon as possible on your Windows 10 system.

Way 1: Perform a Registry Tweak

Step 1: Access Registry Editor in Windows 10.

Step 2: In the Registry Editor, browse to the path listed here:

HKEY_LOCAL_MACHINESYSTEM/CurrentControlSet/services/BFE

After navigating to the BFE option, right-click on BFE and choose Permissions… option from the context menu.

choose Permissions option

Step 3: This will open Permissions for BFE dialog, click Add button.

click Add button

Step 4: In the Select Users or Groups, type Everyone and click OK button.

type Everyone

Step 5: Select Everyone under Group or user names and check the Full Control option under Permissions for Everyone. Then click Apply followed by OK.

check Full Control option

Restart the PC to save the changes.

It is noticed that this method is suitable for most users, because this method is from Microsoft’s official BBS, so you can look forward to repairing the Unable to Activate Windows Defender Firewall error.

Way 2: Change the Value data of Windows Defender

Step 1: Go to Registry Editor window and locate to the following registry key:

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesWinDefend

Step 2: Select WinDefend and double-click Start DWORD.

double-click Start DWORD

Step 3: Set the value as 2 in the Value data field and click OK button.

set the Value data

Close the registry editor and restart the PC. You should be able to fix the problem of not being able to activate Windows defense firewall.

Way 3: Restart Windows Defender Firewall Service

Step 1: Open Services snap-in window in Windows 10.

Step 2: Look for and double-click Windows Defender Firewall in the service.msc window.

look for Windows Defender Firewall

Step 3: Be sure that the Startup type is set to Automatic. And check whether the Unable to Activate Windows Defender Firewall issue fixes or not.

set Startup type as automatic

Way 4: Reset Windows Defender Firewall Settings

Step 1: Launch Control Panel in Windows 10.

Step 2: In the Control Panel window, select System and Security option.

select System and Security

Step 3: Click on Windows Defender Firewall link.

click Windows Defender Firewall

Step 4: Click the Restore defaults link from the left side of the window.

click Restore defaults link

Step 5: Click the Restore defaults button again.

click restore defaults again

Step 6: Click Yes to confirm the changes. And see if you are able to fix Unable to Activate Windows Defender Firewall issue.

click Yes to confirm

Way 5: Forcibly Enable Windows Firewall using Command Prompt

Step 1: Open Command Prompt as Administrator in Windows 10.

Step 2: In the administrative command prompt, type the following commands and press Enter.

netsh firewall set opmode mode=ENABLE exceptions=enable

type commands and press Enter

Step 3: Close the command prompt and restart the PC to save the changes. The problem should be fixed.


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