Users also complain about Avast using high CPU on the computer.

Why can’t Avast turn on the firewall?

The Avast firewall is not working or turning on for several reasons. However, conflict with Windows Firewall is the most common cause of the problem. So, Avast may run into issues if Windows Firewall is enabled. Other factors that can be responsible for the Avast firewall not turning on are:

Outdated Avast client – Users can encounter issues with the Avast client on their computers if it is outdated. Also, there may be bugs impeding its performance, causing it not to work as it should. So, the Avast firewall may not turn on if the app is outdated. Corrupt system files – The Avast firewall can run into issues if there are malicious or corrupt files on your system. These files can block the activities of the Avast antivirus and other programs running on your computer. Issues with Avast installation files – The Avast client on your PC may encounter difficulties if its installation files are missing or corrupt.

These are some common causes of Avast antivirus not turning on. Fortunately, users can fix the problem by troubleshooting their apps and computers.

What can I do if Avast cannot turn on Firewall?

We recommend you go through the following preliminary checks before proceeding with any advanced solution:

Turn off background apps that are running on your PC. Restart Windows in Safe Mode and see if the Avast firewall works.

If it doesn’t, try the solutions below:

1. Disable Windows Firewall

Disabling the Windows Defender Firewall can fix any conflicts with the service and Avast, allowing Avast Firewall to work. SPONSORED

2. Scan your PC and run the Repair Tool

Performing a Full Virus Scan will find and remove any threats that may cause problems with your computer and Avast.

3. Uninstall and reinstall the Avast antivirus with Utility

The uninstall tool will uninstall the Avast app and clear every residue it can leave on your PC.

4. Update Windows OS

Windows updates will fix bugs on your PC that can cause issues with the Avast antivirus client. Also, read about how to fix Windows not connecting to update services on your PC.

5. Perform a Clean boot

A clean boot will prevent any third-party app from launching from the start, blocking any interference from the apps. Also, it’ll disable startup apps that may prompt the error. Conclusively, you can check what to do if Avast is not updating the virus definitions for some reason. Leave your questions and suggestions in the comments section.

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