Firewall - FAQs

General

What is 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 enabled and, when prompted, select the appropriate Firewall profile for each network you connect to.

How can I disable Firewall?

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

To disable Firewall:

  1. Open the Avast Antivirus user interface.
  2. Click Protection in the left panel.
  3. Select the Firewall tile.
  4. Click the (ON) slider and select a listed time duration.
We do not recommend selecting the Stop indefinitely option to stop Firewall permanently.

The slider is (OFF), and Firewall is disabled for the selected time duration.

How can I enable Firewall?

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

To enable Firewall:

  1. Open the Avast Antivirus user interface.
  2. Click Protection in the left panel.
  3. Select the Firewall tile.
  4. Click the red (OFF) slider so that it changes to green (ON).

Firewall is enabled and protecting your PC.

How can I manage my Firewall profiles?

Open the Avast Antivirus user interface, and click ProtectionFirewall to access the main Firewall screen.

Each network that you are connected to appears under the heading Current network. In the Firewall profile column, you can 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.
Every time you access a known network, Avast remembers and automatically applies the Firewall profile that you previously set. 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.

How can I see my recent Firewall activity?

Under Apps recently managed by your firewall on the main Firewall screen in Avast, 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 fewer 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.

Is Firewall a free feature?

No. Firewall is a feature available only for Avast Premium Security and Avast Omni.

Settings

What are Network connections?

The Network connections screen displays a table of information regarding all recent incoming and outgoing communication with the applications and processes running on your PC.

To access Network connections, open the Avast Antivirus user interface and go to ProtectionFirewallNetwork connections. From this table, you can perform the following actions:

  • Tick the boxes above the table to alter the displayed information for each connection.
  • Right-click any connection to view its Application and Packet rules, or kill the connection completely.
  • Click a connection, then select File Details at the bottom of the table to learn more about the application, process, or connection you selected.

What are Firewall logs?

The Firewall Logs screen displays a record of Firewall activity history.

To access Firewall Logs, open the Avast Antivirus user interface and go to ProtectionFirewallFirewall logs. Use the drop-down menu next to Show log for and select one of the following categories to view the activity:

  • Blocked Traffic: connections that were blocked due to a rule in Firewall policies or Application rules.
  • Rules: other Firewall actions, such as the automatic creation of a rule for allowing or blocking connections.

On this screen, you can also search for a specific activity for an activity type (Blocked Traffic or Rules) by defining a time frame and unit next to Show for last, or ticking the box next to Filter and typing your search into the relevant search fields. Click Refresh to update the log using your defined criteria.

What are Application rules?

Firewall creates rules each time an application or process starts for the first time. These rules determine how Firewall behaves toward each application or process when it connects to the internet or to another network. You can set connection allowances for each individual application to determine how strictly Firewall monitors any incoming or outgoing communication. However, we recommend you only modify your Application Rules if absolutely necessary. Usually Firewall can optimize rules without your input.

To configure the application rules, open the Avast Antivirus user interface and go to ProtectionFirewallApplication settings. Click a group (or vendor name) in the Application column, then in the Allowed connections column, use the orange bars to set the authorization level:

  • One bar: (Friends out): outgoing connections with Friend networks only.
  • Two bars: (Friends in/out): incoming and outgoing connections with Friend networks only.
  • Three bars: (Internet out): all outgoing connections to the internet.
  • Four bars: (Friends in and Internet out): incoming connections with Friend networks only, and all outgoing connections to the internet.
  • Five bars: (All connections): all incoming and outgoing connections to the internet.
  • To Block all connections for an application, hover your cursor over the orange bars and click the red block symbol that appears.
Networks referred to as 'Friends' are any networks outside of your current network that are considered trusted by Firewall. These networks are automatically identified and exempt from default Firewall restrictions when your current Network profile is set to Private. When Firewall is set to the Public profile, the default higher level of security is applied to all networks, including the 'Friends' networks.

What are Packet rules?

The Packet rules screen enables you to view and manage Firewall rules that control whether network traffic is allowed or blocked according to the information contained in network packets. This information may include network protocols, source or destination IP addresses, and local and remote ports. Firewall uses packet rules to control network traffic using specified connection parameters, while Application Rules only control traffic according to individual rules for programs or services.

We recommend you only make alterations to packet rules if you have advanced knowledge of firewall concepts. Firewall is already configured to provide the appropriate firewall protection in most cases.

To manage Packet rules, open the Avast Antivirus user interface and go to MenuSettingsProtectionFirewallPacket Rules.

What are System rules?

System rules are a range of Firewall rules that control network traffic for the most common connection types related to specific system capabilites. Configuration changes on the System rules screen directly impact the rules configured in Packet rules. If you change a system rule, the change may affect multiple packet rules.

We recommend you only make alterations to system rules if you have advanced knowledge of firewall concepts or for temporary troubleshooting purposes. Firewall is already configured to provide the appropriate protection in most cases.

To manage System rules, open the Avast Antivirus user interface and go to MenuSettingsProtectionFirewallSystem Rules.

  • Avast Premium Security 19.x
  • Avast Omni 1.x
  • Avast Premier 19.x
  • Avast Internet Security 19.x
  • Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
  • Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
  • Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
  • Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1, 32 / 64-bit

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