Comodo Firewall for Windows

Quick summary

Comodo Firewall provides straightforward, reliable protection for your PC’s network traffic. It filters both incoming and outgoing connections, presents clear alerts, and is suitable for users with any level of technical ability. The program is lightweight compared with many competitors, so it has a modest footprint on system resources.

Training, detection and reputation database

Like most personal firewalls, this product requires an initial training period so it can learn which applications and services are safe. Thanks to a large application reputation database (containing over a million entries), the learning phase is usually brief and the program can achieve a good detection rate without excessive user intervention.

Interface and control options

The user interface is clean and organized into several sections that expose the main features (Summary, Firewall, Defense+ and additional tools). You can adjust both the overall security posture and the verbosity of notifications to match your comfort level — from minimal prompts to strict blocking and frequent alerts.

Practical quirks and behavior

While the firewall is excellent for beginners because of its simple setup and friendly layout, it sometimes asks repeatedly for permissions it previously granted. That can be annoying if you prefer fewer interruptions, although most users tolerate this during the initial learning window.

Impact on performance

Overall resource use is low, and recent improvements aim to reduce the real-time performance impact on daily operations. The application runs efficiently on modern systems, making it a good choice for users who need protection without noticeable slowdowns.

Update highlights

• Fixed: Resolved crashes in the antivirus component that occurred during or immediately after virus database updates.
• Fixed: Addressed an issue where scanning certain specially crafted .PST files caused the antivirus to crash.
• Fixed: Corrected a situation that led to unusually high DPC latency under specific conditions.
• Fixed: Patched a problem where the firewall failed to detect MAC spoofing even when ARP cache protection was enabled.
• Fixed: Fixed installer conflicts that caused some setup programs to crash when the security suite was present.
• Fixed: Stopped occasional blocking of legitimate applications such as Skype and legacy messaging clients.
• Improved: HIPS now allows some actions that previously blocked legitimate behavior that could appear malicious.
• Improved: HIPS no longer prevents legitimate modifications to protected files in certain legitimate scenarios.
• Improved: Installation experience on Windows 7 and newer has been streamlined and made more reliable.
• Improved: Further optimizations to lower the real-time performance impact during everyday PC use.