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The Firewall controls all network traffic to and from the system. This is accomplished by allowing or denying individual network connections based on specified filtering rules. It provides protection against attacks from remote devices and can block potentially threatening services.

icon_section Basic

Enable Firewall

We recommend that you leave this feature enabled to ensure the security of your system. With the firewall engaged, network traffic is scanned in both directions.

Also evaluate rules from Windows firewall

In automatic mode, allow also incoming traffic allowed by rules from Windows Firewall, unless explicitly blocked by ESET rules.

Filtering mode

The behavior of the firewall changes based on the filtering mode. Filtering modes also influence the level of user interaction required.

The following filtering modes are available for the ESET Internet Security Firewall:

Filtering mode


Automatic mode

The default mode. This mode is suitable for users who prefer easy and convenient use of the firewall without the need to define rules. Custom, user-defined rules can be created but are not required in Automatic mode. Automatic mode allows all outbound traffic for a given system and blocks most inbound traffic with the exception of some traffic from the Trusted Zone (as specified in IDS and advanced options/Allowed services) and responses to recent outbound communications.

Interactive mode

Enables you to build a custom configuration for your Firewall. When a communication is detected and no existing rules apply to that communication, a dialog window reporting an unknown connection will be displayed. The dialog window gives the option to allow or deny the communication, and the decision to allow or deny can be saved as a new rule for the Firewall. If you choose to create a new rule, all future connections of this type will be allowed or blocked according to that rule.

Policy-based mode

Blocks all connections that are not defined by a specific rule that allows them. This mode enables advanced users to define rules that permit only desired and secure connections. All other unspecified connections will be blocked by the Firewall.

Learning mode

Automatically creates and saves rules; this mode is best used for the initial configuration of the Firewall, but should not be left on for prolonged periods of time. No user interaction is required, because ESET Internet Security saves rules according to pre-defined parameters. Learning mode should only be used until all rules for required communications have been created to avoid security risks.

icon_section Advanced


Rules setup enables you to view all rules applied to traffic generated by individual applications within trusted zones and the internet.



You can create an IDS rule when a Botnet attacks your computer. A rule can be modified in Advanced setup (F5) > Network protection > Network attack protection > IDS rules by clicking Edit.

Allowed services

Configure access to common network services running on your computer. See allowed services for more information.

icon_section Firewall profiles

Firewall profiles can be used to customize the behavior of the ESET Internet Security Firewall by specifying different sets of rules in different situations.

icon_section Application modification detection

The application modification detection feature displays notifications if modified applications, for which a firewall rule exists, attempt to establish connections.