Best Firewall Software for Linux of 2026

ThreatLocker is a Zero Trust security platform that stops cyber threats by allowing only approved applications and activity to run. It removes standing admin rights, enforces least privilege, and gives organizations precise control over software behavior. With capabilities like application control, ringfencing, and device and storage restrictions, it prevents ransomware, zero day exploits, and unauthorized actions before they can execute. Purpose built for IT and security teams, ThreatLocker offers centralized management and full visibility across endpoints, users, and applications. It helps shrink the attack surface, restrict lateral movement, and meet compliance requirements with detailed auditing. Quick to deploy and easy to manage, the platform includes a large maintained application library and simplified approval workflows, enabling stronger security with less operational burden while keeping the business running smoothly.

Imunify360 provides security solutions for web-hosting servers. Imunify360 is more than antivirus and WAF. It combines an Intrusion Prevention & Detection system with an Application Specific Web Application Firewall, Real time Antivirus protection, and Patch Management components into one security suite. Imunify360 is fully automated and displays all statistics in an intuitive dashboard.

Heimdal® Endpoint Detection and Response is our proprietary multi-solution service providing unique prevention, threat-hunting, and remediation capabilities. It combines the most advanced threat-hunting technologies in existence: Heimdal Next-Gen Antivirus, Heimdal Privileged Access Management, Heimdal Application Control, Heimdal Ransomware Encryption Protection, Heimdal Patch & Asset Management, and Heimdal Threat Prevention. With 6 modules working together seamlessly under one convenient roof, all within one agent and one platform, Heimdal Endpoint Detection and Response grants you access to all the essential cybersecurity layers your business needs to protect itself against both known and unknown online and insider threats. Our state-of-the-art product empowers you to quickly and effortlessly respond to sophisticated malware with stunning accuracy, protecting your digital assets and your reputation in the process as well.

NextDNS offers comprehensive protection from various security risks, effectively blocking advertisements and trackers across websites and applications while ensuring a secure and monitored online experience for children on all devices and networks. You can assess your security needs and customize your protection by activating over ten different safety measures. By utilizing reliable threat intelligence feeds that contain millions of harmful domains and update constantly, you can enhance your defense mechanisms. Our system goes beyond merely tracking domains; it evaluates DNS queries and responses instantaneously, allowing for the swift identification and prevention of harmful activities. Given that there is often only a brief window of hours from when a domain is registered to when it is used in an attack, our advanced threat intelligence framework is designed to identify malicious domains more efficiently than traditional security methods. Additionally, you can effectively eliminate advertisements and trackers in both websites and applications, including even the most sophisticated ones, by leveraging the most widely used ad and tracker blocklists, which include millions of domains that are refreshed in real-time. Ultimately, NextDNS empowers users with tools to create a safer browsing environment tailored to their specific security needs.

Multilayered endpoint security utilizing behavior-based analysis offers robust defenses against both familiar and emerging threats. It provides complete real-time oversight of your entire software inventory, regardless of location. The FortiClient endpoint protection service, tailored for small and medium enterprises, is delivered via the cloud. This cohesive endpoint protection platform delivers automated next-generation threat defense, granting visibility and control over your software and hardware assets within the broader security framework. It enables the identification and remediation of vulnerable or compromised systems throughout your attack surface. As an integral component of the Fortinet Security Fabric, FortiClient connects endpoints to enhance early detection and prevention of sophisticated threats. Security events, including zero-day malware attacks, botnet identifications, and detected vulnerabilities, are communicated instantly. With its comprehensive approach, this solution not only safeguards your assets but also streamlines security management.

Our comprehensive suite of cloud services allows you to build your cloud server your way. Kamatera’s infrastructure is specialized in VPS hosting. With 24 data centers around the world, including 8 in the US, as well as in Europe, Asia and the Middle East, you can choose from. Our enterprise-grade cloud server can meet your requirements at any stage. We use cutting edge hardware, including Ice Lake Processors, NVMe SSDs, and other components, to deliver consistent performance and 99.95% uptime. With a robust service such as ours, you'll get a lot of great features like fantastic hardware, flexible cloud setup, Windows server hosting, fully managed hosting and data security. We also offer consultation, server migration and disaster recovery. We have a 24/7 live support team to assist you in all time zones. With our flexible and predictable pricing plans, you only pay for the services you use.

IPFire is an advanced, robust, and secure Open Source firewall built on the Linux platform. Its user-friendly interface, exceptional performance across various environments, and adaptability make it suitable for a wide range of users. Prioritizing security above all, IPFire is fortified to defend against online threats while simultaneously safeguarding your network from potential intrusions. The firewall's robust engine and its integrated intrusion prevention system work in tandem to shield your network from cyber attacks and denial-of-service threats. Developed as free software by a collaborative community, IPFire is trusted by hundreds of thousands of users globally. The core aim of IPFire is to ensure maximum security, and it is designed for easy configuration to establish a firewall engine that effectively blocks unauthorized access. By default, IPFire organizes the network into distinct zones with tailored security policies, such as LAN and DMZ, allowing for effective risk management and customized configurations to cater to specific requirements. This thoughtful design enhances the overall security posture of any network it protects.

Akamai Cloud (previously known as Linode) provides a next-generation distributed cloud platform built for performance, portability, and scalability. It allows developers to deploy and manage cloud-native applications globally through a robust suite of services including Essential Compute, Managed Databases, Kubernetes Engine, and Object Storage. Designed to lower cloud spend, Akamai offers flat pricing, predictable billing, and reduced egress costs without compromising on power or flexibility. Businesses can access GPU-accelerated instances to drive AI, ML, and media workloads with unmatched efficiency. Its edge-first infrastructure ensures ultra-low latency, enabling applications to deliver exceptional user experiences across continents. Akamai Cloud’s architecture emphasizes portability—helping organizations avoid vendor lock-in by supporting open technologies and multi-cloud interoperability. Comprehensive support and developer-focused tools simplify migration, application optimization, and scaling. Whether for startups or enterprises, Akamai Cloud delivers global reach and superior performance for modern workloads.

The pfSense project provides a free network firewall distribution. It is based on FreeBSD's operating system with a custom kernel. Third-party free software packages are also included. The package system allows pfSense software to offer the same functionality as or more common commercial firewalls without any artificial limitations. It has replaced every major commercial firewall in many installations around the globe, including Check Point and Cisco PIX, Cisco ASA and Juniper.

Fortinet stands out as a prominent global entity in the realm of cybersecurity, recognized for its all-encompassing and cohesive strategy aimed at protecting digital infrastructures, devices, and applications. Established in the year 2000, the company offers an extensive array of products and services, which encompass firewalls, endpoint security, intrusion prevention systems, and secure access solutions. Central to its offerings is the Fortinet Security Fabric, a holistic platform that effectively melds various security tools to provide enhanced visibility, automation, and real-time intelligence regarding threats across the entire network. With a reputation for reliability among businesses, governmental bodies, and service providers across the globe, Fortinet places a strong emphasis on innovation, scalability, and performance, thereby ensuring a resilient defense against the ever-evolving landscape of cyber threats. Moreover, Fortinet’s commitment to facilitating digital transformation and maintaining business continuity further underscores its role as a pivotal player in the cybersecurity industry.

Traditional packet filters are gradually becoming outdated, as even open-source solutions are shifting towards Next-Generation Firewalls. OPNsense stands out as a leading option for features like intrusion detection, application control, web filtering, and antivirus protection. No network, regardless of its size, is immune to potential attacks; even devices in home networks, such as washing machines and smartwatches, are at risk and need robust security measures. Firewalls play a crucial role in a comprehensive security strategy, shielding systems from both established and emerging threats. The effectiveness of a firewall is maximized when its capabilities are well understood, it operates intuitively, and is strategically placed within the network infrastructure. OPNsense rises to the occasion by fulfilling these essential requirements in various ways. This book serves as an invaluable guide for anyone looking to comprehend, install, and configure an OPNsense firewall effectively. Ultimately, understanding the intricacies of OPNsense can empower users to create a more secure digital environment.

Data is the most valuable asset of your company, so it is important to protect it. Network security is about zero trust. You should never trust anyone outside or within your network perimeter. Network security is becoming more difficult because network perimeters are blurring and endpoints continue proliferating. Cyberattacks are also being launched using machine learning and automation. Organizations are shifting to the cloud to protect their data in a hybrid cloud/on premises environment. This is without adding cost or complexity. A huge step towards secure environments is the combination of micro-segmentation and real-time network governance. You can improve your security posture through automation and data by choosing the right software solution. ditno is a cybersecurity management platform that offers a zero trust network approach to simplify and improve security.

As a pioneer in open-source networking, VyOS Networks empowers enterprises with automated, secure, and scalable connectivity across cloud, edge, and physical hardware. Engineered for ultimate flexibility, our enterprise-class platform drives seamless automation and robust performance without the trap of proprietary vendor lock-in. We are dedicated to returning infrastructure ownership back to you through completely neutral and transparent solutions. VyOS Universal Router provides a single, consistent networking layer across all of them: • Same operating system • Same configuration model • Same CLI and APIs • Same automation workflows • Same operational model across tenants and regions Your network, your rules.

AP Lens is a Sandbox Browser designed to enhance network security through DNS Whitelisting, effectively preventing attacks from penetrating the network. What features does AP Lens offer? - Web Filtering: Offers adaptable and user-friendly options for content blocking. - Anti-Phishing: Eliminates look-alike domains with complete precision. - Ransomware Protection: Safeguards the network while allowing business applications to function smoothly. - Secure Remote Work: Implements internet usage policies efficiently without the delays associated with VPNs. - No More 0-Day Attacks: Overcomes the limitations of traditional blacklisting through the AP Lens Augmented Whitelist. - Compliant: Aligns with regulatory standards set forth by cybersecurity insurance policies. - One-Click Installation: Allows for quick setup without requiring extensive user intervention or updates. - No Maintenance: Prevents malware and phishing threats without the need for ongoing oversight. With a foundation built on over 20 years of expertise in cybersecurity, cloud security, and information protection across various sectors, including private banking and public services, our team is equipped to address the evolving challenges in digital security.

CrowdSec, a free, open-source, and collaborative IPS, analyzes behaviors, responds to attacks, and shares signals across the community. It outnumbers cybercriminals. Create your own intrusion detection system. To identify cyber threats, you can use behavior scenarios. You can share and benefit from a crowdsourced, curated cyber threat intelligence platform. Define the type and location of the remediation you wish to apply. Use the community's IP blocklist to automate your security. CrowdSec can be run on containers, virtual machines, bare metal servers, containers, or directly from your code using our API. Our cybersecurity community is destroying cybercriminals' anonymity. This is our strength. You can help us create and distribute a qualified IP blocklist that protects everyone by sharing IP addresses you have been annoyed by. CrowdSec can process massive amounts of logs faster than Fail2ban, and is 60x faster than Fail2ban.