The Firewall feature in Avast Antivirus monitors the network traffic between your PC and the outside world to help protect you from unauthorized communication and intrusions. This feature is designed to require minimal input from you. To ensure you have protection, all you need to do is keep Firewall enabled.

Manage apps

Firewall controls when the apps on your PC can connect to the internet or to other networks. Firewall creates default rules for an app when it starts for the first time.

To manually specify how Firewall handles connection attempts from individual apps:

1. Open Avast Antivirus and go to Protection ▸ Firewall.
2. Ensure the Apps tab is selected, then select one of the following sub-tabs:
   • Active: View the apps that are currently using your internet connection.
   • Inactive: View the apps that are not currently using your internet connection.
   • Blocked: View the apps that are currently blocked from using your internet connection.
   • All: View the apps that are installed on your PC.
   
3. The following options are available for each app:
   1. Click Block in the relevant panel to ensure that Firewall always stops this app from connecting to the internet or to other networks.
   2. Click … More options (the three dots) to choose from the following:
      • Turn on Ask me Mode: Ensure that Firewall prompts you to manually allow or deny each connection attempt for this app.
      • Show app details: View basic information about this app.
      • Show app rules: Open the advanced Application rules for this app.
   

Unblock apps

When you block an app, it appears on your list of blocked apps. To unblock an app:

1. Ensure the Apps tab is selected, then click the Blocked sub-tab.
2. Click Unblock next to the relevant app.

This app can now connect to the internet and to other networks.

Add trusted and untrusted networks

Every time you connect to a new network, Firewall detects if the network is private or public, and automatically applies the relevant settings below:

• Private networks (such as your home or work network) require a lower level of security, and are automatically marked as trusted. Each time you connect to a trusted network, Firewall permits all communication within the network and applies a lower level of security to enable better connectivity.
• Public networks (such as in a cafe or airport) present a greater security risk, and are automatically marked as untrusted. Each time you connect to an untrusted network, Firewall blocks all incoming communication and applies a higher level of security to ensure your privacy and safety.

If necessary, you can manually specify that an individual network is either trusted or untrusted by following the steps below:

1. Open Avast Antivirus and go to Protection ▸ Firewall.
2. Select the Networks tab.
3. Click Show settings next to the relevant network, then choose one of the following options:
   • I trust this network: The recommended option for a private network. When you select this option, the network is marked as a Trusted network. Each time you connect to a trusted network, Firewall permits all communication within the network and applies a lower level of security to enable better connectivity.
   • I don't trust this network: The recommended option for a public network. When you select this option, the network is marked as an Untrusted network. Each time you connect to an untrusted network, Firewall blocks all incoming communication and applies a higher level of security to ensure your privacy and safety.
   

Each time you connect to this network, Firewall applies the appropriate settings according to your preferences.

View Firewall logs

To view your recent Firewall activity:

1. Open Avast Antivirus and go to Protection ▸ Firewall.
2. Select the Logs tab.
3. Click the arrow beside Apps blocked in the past month, then select one of following options:
   • Blocked apps
   • Blocked devices
   • Applied rules
   You can also specify a time period (for example, Devices blocked in the past month).

The list automatically updates to show your chosen data.

Access premium features

The following premium Firewall features are available in Avast Premium Security:

• Leak Protection: Increases your security on public networks by preventing your PC from leaking potentially sensitive information to the network, including your login credentials, computer name, and email address.
• Port Scan Alerts: Alerts you if hackers or malware attempt to scan your PC for open ports.
• ARP Spoofing Alerts: Alerts you if an attacker attempts to intercept your network traffic via an ARP spoofing attack. ARP spoofing is when an attacker exploits the Address Resolution Protocol (ARP) to trick the devices on a network into communicating with an external device that is controlled by the attacker.

To manage the premium Firewall features:

1. Open Avast Premium Security and go to Protection ▸ Firewall.
2. Select the Premium tab.
3. Select your preferred option:
   • Enable a premium feature: Click the red (OFF) slider so that it changes to green (ON).
   • Disable a premium feature: Click the green (ON) slider so that it changes to red (OFF).
   

For more information about the premium Firewall features, refer to the following article:

• Avast Firewall - FAQs

Advanced settings

The Firewall Rule list contains a list of advanced rules that you can customize to more precisely control Firewall behavior.

To access advanced Firewall rules:

1. Open Avast Antivirus and go to Protection ▸ Firewall.
2. Click Settings (the gear icon) in the top-right corner of the screen.
3. Click View Firewall rules.
4. Select the relevant tab:
   • Basic rules (previously known as System rules): Are a range of Firewall rules that control network traffic for the most common connection types.
   • Network rules (previously known as Packet rules): Control whether network traffic is allowed or blocked according to the information contained in network packets.
   • Application rules: Determine how Firewall behaves toward each application or process when it connects to the internet or to another network.
   

For detailed information about the options available on each screen, refer to the relevant article below:

• Basic rules | Network rules | Application rules

Enable or disable Firewall

To ensure your security, Firewall is enabled by default. We recommend keeping Firewall enabled at all times, unless you need to disable it temporarily for troubleshooting purposes.

To disable Firewall temporarily:

1. Open Avast Antivirus and go to Protection ▸ Firewall.
2. Click the green (ON) slider, then select a time duration.
3. Click Ok, stop to confirm.

Firewall is temporarily disabled. To enable Firewall, follow step 1 above, then click the slider so that it changes from red (OFF) to green (ON).

Further recommendations

To learn more about the Firewall feature in Avast Antivirus, refer to the following article:

• Avast Firewall - FAQs

Updated on: 02/06/2022