Access this feature from: Protection ▸ Firewall

Firewall monitors all network traffic between your PC and the outside world to protect you from unauthorized communication and intrusions. This feature is designed to require minimal input from you. To ensure you are protected, all you need to do is keep Firewall turned on and, when prompted, select the appropriate Firewall profile for each network that you connect to:

These profiles control the settings which determine how strictly Firewall protects your PC.

Note: Firewall is available in Avast Premier and Avast Internet Security only.

Manage Firewall activity

To ensure your full security, Firewall is enabled by default. We recommended you keep Firewall turned on at all times unless you need to temporarily disable it for troubleshooting purposes.

To disable Firewall, click the ON slider and select a listed time duration. The slider then switches to OFF. We do not recommend to stop Firewall permanently by selecting the Stop indefinitely option.

Manage Firewall profiles

Each network that you are connected to appears under the heading Current network. In the next column, Firewall profile, select the appropriate profile for each network:

  • Private: a lower level of security suitable for when your PC is connected to a trusted network such as your home or work network. This profile enables better connectivity, and permits all communication within the network.
  • Public: a higher level of security suitable for when your PC is connected to a public network such as in a cafe or airport. Because public networks present greater security risks, no incoming communication is permitted when this profile is set.

Each time you access a known network, Avast remembers and applies the applicable Firewall profile (as previously set by you). Although you can manage your network Firewall profiles on this screen, each time you connect to a new network, Avast prompts you to select the appropriate profile. The default profile setting when no profile is selected is Public.

View recent Firewall activity

Under Apps recently managed by your firewall, you can see the system and non-system apps that Firewall has recently Allowed or Blocked from communicating with your PC. For most users, these details are entirely informational.

When you are connected to a Private network, most apps are Allowed because less Firewall restrictions are imposed. When you are connected to a Public network, more apps are Blocked because the protection level is higher. If an app is blocked while you are connected to a Private network, Firewall has detected and blocked suspicious communication attempts. No actions are required from you.

Modify Firewall settings

The following options are available via Settings for advanced use:

  • Network connections: manage current connections in real-time.
  • Firewall Logs: check your Firewall activity history. This section may be useful when troubleshooting issues with Avast Support representatives or other security experts. Read more...
  • Application rules: manually specify rules for individual applications and processes. Read more...

If you are an advanced user who wants to make further configuration changes, click Settings to access the following Firewall attributes:

  • Policies: set rules for blocking unauthorized access while permitting authorized communication. Read more...
  • Network profiles: manage your preferences for profile switching. Read more...
  • Friends: specify trusted networks that you want to exempt from default Firewall restrictions while connected to a Private network. Read more...
  • Advanced: access settings related to Firewall Logs, Port Scan Detections, and Raw Sockets. Read more...

Note: Only make configuration changes if you have an advanced understanding of firewall principles.

Troubleshoot issues

We recommended you keep Firewall turned on at all times. If you need to temporarily disable it, for example, to check if an application is being blocked, click the ON slider and select a listed time duration. The slider then switches to OFF. We do not recommend you turn this feature off indefinitely by selecting the Stop permanently option.