[Solved] Fix windows-firewall-error Windows - 5 Minute Method

Verified & Tested Updated February 26, 2026

Quick Summary

The Windows Firewall error is a common issue that occurs when the Windows Firewall service is not functioning correctly, preventing it from blocking or allowing certain network connections. This error can occur due to various reasons such as misconfigured settings, corrupted system files, or conflicts with other security software, and it may appear when trying to access the internet, launch certain applications, or during the installation of new software.

Common Causes

  • Misconfigured Windows Firewall Settings: Incorrectly configured Windows Firewall settings can cause this error, such as blocked or allowed programs and ports that are not properly set up.
  • Corrupted System Files: Damaged or corrupted system files can prevent the Windows Firewall from functioning correctly, leading to errors.
  • Conflicts with Other Security Software: Conflicts with other security software installed on the system can cause the Windows Firewall error, as they may interfere with the Windows Firewall's functionality.
  • Virus or Malware Infections: Virus or malware infections can also cause the Windows Firewall error by modifying system files or settings, disrupting the normal functioning of the Windows Firewall.

Step-by-Step Fixes

Method 1: Restart the Windows Firewall Service Show Steps ↓

To restart the Windows Firewall service, follow these steps:

  1. Press the Windows key + R to open the Run dialog box.
  2. Type services.msc and press Enter.
  3. In the Services window, scroll down and find the Windows Defender Firewall service.
  4. Right-click on the service and select Restart.
  5. Wait for the service to restart and then try to access the internet or launch the application again.
Method 2: Run the System File Checker Tool Show Steps ↓

To run the System File Checker tool, follow these steps:

  1. Press the Windows key + X and select Command Prompt (Admin).
  2. In the Command Prompt window, type sfc /scannow and press Enter.
  3. Wait for the scan to complete and then restart your computer.
  4. After restarting, try to access the internet or launch the application again.
Method 3: Reset Windows Firewall Settings to Default Show Steps ↓

To reset Windows Firewall settings to default, follow these steps:

  1. Press the Windows key + R to open the Run dialog box.
  2. Type control panel and press Enter.
  3. In the Control Panel, click on System and Security and then click on Windows Defender Firewall.
  4. Click on Restore defaults and then click on Restore.
  5. Wait for the settings to be reset and then try to access the internet or launch the application again.
Method 4: Disable Conflicting Security Software Show Steps ↓

To disable conflicting security software, follow these steps:

  1. Press the Windows key + R to open the Run dialog box.
  2. Type control panel and press Enter.
  3. In the Control Panel, click on Programs and Features.
  4. Find the conflicting security software and click on it.
  5. Click on Uninstall or Disable to remove or disable the software.
  6. Wait for the software to be uninstalled or disabled and then try to access the internet or launch the application again.
Method 5: Perform a Clean Boot Show Steps ↓

To perform a clean boot, follow these steps:

  1. Press the Windows key + R to open the Run dialog box.
  2. Type msconfig and press Enter.
  3. In the System Configuration window, click on the Services tab.
  4. Check the box next to Hide all Microsoft services and then click on Disable all.
  5. Click on the Startup tab and click on Open Task Manager.
  6. In the Task Manager, click on the Startup tab and disable all startup programs.
  7. Close the Task Manager and click on OK in the System Configuration window.
  8. Restart your computer and try to access the internet or launch the application again.

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