Avast Firewall Won’t Start? Here’s How to Fix it!

Avast is one of the top antivirus and widely popular as well. As of 2017, it had the largest share of the market for antivirus applications. In Feb 2018, Avast Free Antivirus received 6 out of 6 points in “Protection” category, detecting 100% of malware samples used in the test of various antimalware tests and earning an “AV-TEST Certified” seal. However, one may encounter few problems as the software is quite diversified. One of the problems faced by users is when the Avast Firewall won’t start. 

See Also: 10 Best Anti-Spyware Tools for Windows (Free & Paid)

Why does this error occur?

It may occur due to system changes or damaged registry or installation files. Malicious programs may also lead to error of Avast Firewall not starting.

 If you encounter this type of issue, please continue reading to resolve this issue.

See Also: How to Fix Error 651 in Windows (6 Best Methods 2021)

5 Solutions to fix ‘Avast Firewall Won’t Start’ Issue

The real problem here is that a disabled firewall means that the computer isn’t secure from all the harmful foreign attacks and can cause harm to your personal data. Hence this problem should be taken care of straight away. Here are steps you can take to fix Avast Firewall won’t start issue.

Scan Your Computer

Sometimes, few malicious files may be cause of avast firewall not turning on. Hence perform a full computer scan to figure out this issue.

 Step 1 – Open Avast Antivirus software and move to the Status window.

avast status window
Avast status window

Step 2 – Click on Full System Scan and run a full scan of your computer.

avast full system scan
Avast full system scan

Step 3 – A progress bar will be shown, which will move forward as the scan progresses.

avast status bar
Avast status bar

If you observe anywhere that the scan is slowing down compared to its original speed, then it is an indicator that some malware files are present in your system. After completion of the scan and results are visible, you can remove the threats detected by the computer. This should solve your problem, and now you won’t get the prompt that your avast firewall won’t start.

If the problem still persists, try 

Avast Repair and Reboot

You should try fixing the Avast client program mounted on your PC to fix the errors that triggered the “Avast can’t turn on firewall” bug.

Step 1

 Click on the Windows button present on the taskbar, search Control Panel.

select control panel
Select Control Panel

Step 2 

Under Control Panel, click on Programs and Features.

control panel window
Control Panel Window

Step 3

Find “Avast” in the dropdown list of installed programs and click on uninstall/change. Then click on repair avast icon on top.

repair avast
Repair Avast

Now, Avast will repair the client software by making the required changes. Reboot your system and see if the error is resolved or not and the avast firewall can be started or not.

Try Turning Off Windows Firewall

As “Avast” and “Windows” firewalls cannot co-exist and hence create issues for your system. It may be the cause of error avast can’t start firewall, making it prone to various attacks. 

Step 1

Go to the windows button on the taskbar and search Control Panel. [You can open the control panel through the RUN function as well.]

select control panel
Select Control Panel

Step 2

Find Windows Defender Firewall and click “Turn Windows Defender Firewall on or off.”

firewall in control panel
Firewall in Control Panel

Step 3

Turn off “Windows Defender Firewall” under both network types-: public and private.

firewall window
Firewall window

Now check if Avast Firewall is starting or not. If everything is done correctly then you won’t get the error that, Avast Firewall won’t start.

Check Conflicting Programs

Only one hardware firewall and one software firewall can run at a time. Your hardware firewall is usually located on a modem or router. Avast is a software firewall. If you are running another firewall, your Avast firewall won’t start. Windows 8 has a built-in firewall. If you want to use Avast, you need to disable it.

Open Windows Firewall from the menu, and then turn it off. After closing, try to open Avast Firewall again.

avast firewall
Avast Firewall

If the avast firewall is prevented from starting for some reason, it may not start automatically because the conflicting program is stopped. Restart the computer, and then start Avast.

Click “Start” to activate the firewall. If application rules are set, try clearing them in the “Firewall” menu to see if one of these rules is also causing firewall problems.

Reinstall Avast Antivirus Software

It is probable that none of this works and avast firewall won’t start still, and hence you’ll have to reinstall it to solve this issue.

However, a normal Windows reinstall feature might not solve your problem; try it with some other softwares like IObit, Geek, and Wise uninstaller.

You can also try to reinstall the software by going into the safe mode BUT before going into the safe mode, download the Avast Uninstall Utility and save the file on the desktop. Remove all the files of avast by restarting your PC in safe mode and boot with safe boot option. You can select safe boot option by typing “misconfig” in RUN command(Windows + R).

avast clear
Avast clear

Once you boot in safe mode, run the avastclear.exe that was downloaded earlier, and all remaining files of “Avast” will be removed.

Once it’s done, you can boot in normal mode now and then download Avast software from their website and reinstall Avast again.


The firewall controls all network traffic and is capable of detecting and blocking unwanted traffic. Since many computers are connected to the internet these days, criminals have a lot of opportunities to locate victim computers. These attackers scan other computers on the internet to decide if they are vulnerable to different forms of attacks and, if your avast firewall won’t start this issue will amplify. A disabled firewall will not protect your computer from external attacks. Therefore, any malicious file may easily damage your computer, install malicious software or steal your data.  Hence, a firewall is really important for your files to remain safe and protect your private data as it acts as a protective watchman in this age of internet today.

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