Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

Error code 0x6d9 is a Windows Firewall error code. This error code happens when the Windows Firewall is not able to communicate with the internet. This can happen if the firewall is not configured properly, or if the firewall is being blocked by another program.

1. Restart your computer and try again

  1. Click on the Start button
  2. Type "cmd" into the Start Search bar and press ENTER
  3. Type "reset" and press ENTER
  4. Type "ping" and press ENTER
  5. Type "netstat" and press ENTER
  6. Type "reboot" and press ENTER
  7. Type "exit" and press ENTER
  8. Type "start" to restart your computer

2. Check for updates and install any that are available

  1. Launch the Windows Update utility.
  2. In the “Windows Update” pane, click on the “Check for updates” button.
  3. If any updates are available, the Windows Update utility will display a list of available updates.
  4. Click on the “Install updates” button to install the updates.
  5. If the updates are not installed automatically, you can install them by clicking on the “Install updates” button again.

3. Run a virus scan

  1. Open the Control Panel.
  2. Click on the System and Security category.
  3. Click on the Virus Scanner tab.
  4. Click on the Add/Remove Programs icon.
  5. Click on the Add/Remove Scanner icon.
  6. In the Select a scanner to scan for viruses field, click on the Virus Scanner option.
  7. Click on the OK button.
  8. Click on the Scan Now button.
  9. If the scan is successful, the Results tab will list the viruses that were found. If there are any errors, the tab will list the error code and a description of the error.

4. Run a malware scan

1.Open the Malwarebytes Scanner and click on the Scan Now button. 2.Select your Operating System and click on the Start Scan button. 3. malwarebytes will scan your computer for malware and if it finds any malicious files, it will show you a list of detected threats. 4. To remove the detected threats, click on the Remove Selected button. 5. Malwarebytes will now ask you to confirm the removal of the detected threats. Click on the Remove button to remove the detected threats.

If the answers above didn't work then you should also try:

  1. Reset your Windows Firewall settings.
  2. Temporarily disable your antivirus software.
  3. Delete any temporary files that may be causing the issue.
  4. Run the System File Checker tool.
  5. Perform a clean boot of your computer.
  6. Contact Microsoft support for further assistance.