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Fix Windows Firewall That Won’t Turn On in Windows 11

Geeksdigit Team

July 3, 2026

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Windows Firewall is an essential security feature that helps protect your computer from unauthorized network access and malicious software. It monitors incoming and outgoing network traffic and blocks suspicious connections based on predefined security rules. If the Windows Firewall won’t turn on in Windows 11, your PC may become vulnerable to security threats and network attacks.

This issue can occur for several reasons, including disabled services, corrupted system files, third-party antivirus software, incorrect registry settings, or failed Windows updates. Fortunately, most firewall problems can be resolved using built-in Windows troubleshooting tools and a few simple fixes.

In this guide, you’ll learn the most effective methods to fix the Windows Firewall that won’t turn on in Windows 11.

Why Won’t Windows Firewall Turn On?

Some common causes include:

• Windows Firewall service is disabled.
• Windows Security is corrupted.
• Third-party antivirus software has disabled the firewall.
• Corrupted system files.
• Network configuration problems.
• Malware infection.
• Damaged Windows Security settings.
• Incorrect Group Policy or Registry settings.
• Failed Windows updates.

Before trying advanced solutions, restart your computer and check whether the firewall starts normally.

Method 1: Restart Your Computer

Temporary Windows glitches can sometimes prevent the firewall service from starting.

1. Save your work.
2. Click Start.
3. Select Power.
4. Click Restart.

After Windows starts, try enabling the firewall again.

Method 2: Turn On Windows Firewall from Windows Security

Windows Firewall is managed through the Windows Security app.

1. Press Windows + I.
2. Select Privacy & security.
3. Click Windows Security.
4. Select Firewall & network protection.
5. Choose your active network.
6. Turn on Microsoft Defender Firewall.

If the option is unavailable or immediately turns off again, continue with the next methods.

Method 3: Start the Windows Defender Firewall Service

If the required service is disabled, the firewall won’t function.

1. Press Windows + R.
2. Type:

services.msc

3. Press Enter.
4. Locate Windows Defender Firewall.
5. Double-click it.
6. Set Startup type to Automatic.
7. Click Start if the service isn’t running.
8. Select Apply.
9. Click OK.

Restart your computer and check whether the firewall works.

Method 4: Verify Required Services

Windows Firewall depends on several background services.

Open Services and ensure these services are running:

• Base Filtering Engine (BFE)
• Windows Defender Firewall
• Remote Procedure Call (RPC)

If any service is stopped, start it and set the startup type to Automatic.

Method 5: Run the Windows Security Troubleshooter

Although Windows 11 doesn’t include a dedicated firewall troubleshooter, Windows Update and security diagnostics may detect related issues.

1. Open Settings.
2. Go to System.
3. Select Troubleshoot.
4. Click Other troubleshooters.
5. Run any available troubleshooters related to Windows Update or Security.

Follow the recommended fixes.

Method 6: Reset Windows Firewall

Restoring the firewall to its default settings often fixes configuration problems.

Using Windows Security

1. Open Windows Security.
2. Select Firewall & network protection.
3. Click Restore firewalls to default.
4. Confirm the reset.

Using Control Panel

1. Open Control Panel.
2. Select Windows Defender Firewall.
3. Click Restore defaults.
4. Confirm your choice.

Restart the computer afterward.

Method 7: Repair Corrupted System Files

Corrupted Windows files can prevent security services from functioning.

Open Command Prompt as Administrator.

Run:

sfc /scannow

Wait for the scan to finish.

Next run:

DISM /Online /Cleanup-Image /RestoreHealth

Restart the computer after both commands complete.

Method 8: Check for Windows Updates

Microsoft frequently releases security and reliability updates.

1. Press Windows + I.
2. Open Windows Update.
3. Click Check for updates.
4. Install all available updates.
5. Restart your computer.

Method 9: Disable Third-Party Antivirus Temporarily

Many third-party security suites include their own firewall.

Examples include:

• Norton
• McAfee
• Bitdefender
• Avast
• AVG
• Kaspersky

Temporarily disable or uninstall the antivirus and check whether Microsoft Defender Firewall can be enabled.

If it works afterward, the third-party software is likely preventing Windows Firewall from starting.

Method 10: Enable Firewall Using Command Prompt

You can manually enable Windows Firewall with an elevated Command Prompt.

Open Command Prompt as Administrator and run:

netsh advfirewall set allprofiles state on

If the command completes successfully, restart your computer.

Method 11: Reset the Firewall Using Command Prompt

If the firewall configuration has become corrupted, reset it.

Run:

netsh advfirewall reset

Restart Windows after the command finishes.

Method 12: Use PowerShell

PowerShell provides another way to enable Windows Firewall.

Open Windows PowerShell as Administrator and run:

Set-NetFirewallProfile -Profile Domain,Public,Private -Enabled True

Wait for the command to finish and restart your PC.

Method 13: Perform a Clean Boot

Some third-party startup applications may interfere with Windows Firewall.

1. Press Windows + R.
2. Type:

msconfig

3. Press Enter.
4. Open the Services tab.
5. Check Hide all Microsoft services.
6. Click Disable all.
7. Open the Startup tab.
8. Click Open Task Manager.
9. Disable all startup applications.
10. Restart the computer.

If the firewall works after a clean boot, re-enable services one at a time to identify the conflicting software.

Method 14: Scan for Malware

Malware can disable Windows Firewall to bypass system security.

Run a full scan using:

• Microsoft Defender Antivirus
• Microsoft Defender Offline Scan
• Another trusted antivirus program

Remove any detected threats and restart your computer.

Method 15: Check Group Policy Settings

Windows 11 Pro and Enterprise users should verify that Group Policy isn’t disabling the firewall.

1. Press Windows + R.
2. Type:

gpedit.msc

3. Press Enter.

Navigate to:

Computer Configuration > Administrative Templates > Network > Network Connections > Windows Defender Firewall

Ensure firewall policies are configured appropriately or left as Not Configured unless managed by your organization.

Method 16: Perform a System Restore

If the firewall stopped working after a recent update or software installation:

1. Search for Create a restore point.
2. Open System Restore.
3. Choose a restore point created before the problem began.
4. Complete the restoration process.

Your personal files won’t be affected.

Common Firewall Error Messages

You may encounter messages such as:

• Windows Defender Firewall can’t change some settings.
• Error 0x80070424.
• Error 0x6D9.
• Windows Firewall service isn’t running.
• Firewall settings cannot be displayed.

These errors are often caused by disabled services, damaged system files, or third-party security software.

Tips to Prevent Firewall Problems

• Keep Windows updated.
• Avoid installing multiple antivirus programs.
• Don’t disable essential Windows services.
• Perform regular malware scans.
• Create restore points before making major system changes.
• Avoid modifying firewall settings unless necessary.

Frequently Asked Questions

Why won’t Windows Firewall start?

The most common reasons include disabled services, corrupted system files, third-party antivirus conflicts, or damaged Windows Security components.

Is it safe to disable Windows Firewall?

No. Disabling the firewall leaves your computer more vulnerable to unauthorized network access and malware. It should remain enabled unless another trusted firewall is actively protecting your system.

Can antivirus software disable Windows Firewall?

Yes. Many third-party antivirus suites include their own firewall and automatically disable Microsoft Defender Firewall to prevent conflicts.

Will resetting the firewall delete my files?

No. Resetting Windows Firewall only restores firewall rules and settings to their defaults. It does not affect your personal files or installed applications.

Conclusion

A Windows Firewall that won’t turn on in Windows 11 can significantly reduce your computer’s security, but the issue is usually easy to resolve. In many cases, simply restarting the Windows Defender Firewall service, resetting the firewall configuration, repairing corrupted system files, or installing the latest Windows updates restores normal functionality.

If the problem persists, check for conflicts with third-party antivirus software, verify that required services such as Base Filtering Engine are running, and perform a malware scan to rule out malicious interference. By following the methods outlined in this guide, you can restore Windows Defender Firewall and keep your Windows 11 PC protected against unauthorized network access and online threats.