Security Controls

FIRE-4512 - Empty iptables ruleset


Lynis checks for the availability of IPtables, but also if the ruleset is not empty. This might indicate bad configuration or a missing ruleset on the system.



How to solve

Usually this control shows up when the iptables module is loaded, while there no firewall rules loaded. Consider turning off the firewall software completely, or preferably populate it with an appropriate firewall policy.

Additional resources

Linux and Unix System Hardening

This information is provided as part of the Lynis community project. It is related to Lynis control FIRE-4512. All information should be considered as-is, without guarantees. Any advice or snippets should be tested before implementing in production environments.


Lynis is a technical security audit tool for systems running Linux, UNIX, *BSD, and macOS. It is open source software and free to use. The project has an active community, and can also be found on GitHub.

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