# Source: https://docs.datadoghq.com/security/default_rules/def-000-81p.md

---
title: Ensure iptables Firewall Rules Exist for All Open Ports
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: >-
  Docs > Datadog Security > OOTB Rules > Ensure iptables Firewall Rules Exist
  for All Open Ports
---

# Ensure iptables Firewall Rules Exist for All Open Ports
 
## Description{% #description %}

Any ports that have been opened on non-loopback addresses need firewall rules to govern traffic.

## Rationale{% #rationale %}

Without a firewall rule configured for open ports default firewall policy will drop all packets to these ports.

## Warning{% #warning %}

Changing firewall settings while connected over network can result in being locked out of the system.