Comodo Firewall is a free network firewall for Windows from Comodo, offering two-way traffic monitoring, per-application network access rules, and a host intrusion prevention system (HIPS) that watches for suspicious program behavior. It also includes Comodo's sandbox technology, which can run unrecognized programs in an isolated environment so they can't make permanent changes to the system. It's distributed as a standalone firewall, or as part of the larger free Comodo Internet Security suite that adds antivirus scanning.
Comodo Firewall vs. Windows Defender Firewall
Windows Defender Firewall handles basic inbound/outbound filtering but offers a fairly limited interface for managing per-application rules. Comodo Firewall adds a more detailed application control layer, host intrusion prevention and sandboxing for unknown executables, giving more visibility and granular control for users who want to review exactly which programs are making outbound connections, at the cost of more configuration prompts than Windows' hands-off default.
Comodo Firewall Features
- Two-Way Firewall — monitors and controls both inbound and outbound network traffic
- Application Control — sets per-program rules for network access
- Host Intrusion Prevention (HIPS) — watches for suspicious behavior from running processes
- Sandbox — runs unrecognized programs in an isolated environment to limit system changes
- Auto-Sandbox Technology — automatically sandboxes unknown files based on trust rating
- Stealth Ports Wizard — hides open ports from external scans
- Network Zone Management — configures trust levels for different networks, such as home or public
How to Install Comodo Firewall on Windows
- Download the installer from the official link on this page or comodo.com.
- Run the setup file and, during installation, watch for and deselect any bundled offers you don't want.
- Restart your PC if prompted, since firewall drivers often require a reboot to activate fully.
- Open Comodo Firewall and let it complete its initial network and application scan.
- Review the alert prompts as programs request network access, choosing Allow or Block per app.
Is Comodo Firewall really free?
Free. Comodo Firewall is free to download and use, with no time limit. Comodo also sells broader paid security suites, but the standalone firewall itself is free.
How to download Comodo Firewall safely
Use the request button on this page and we will email you the current link for www.comodo.com — the publisher's own website — so you receive the authentic build. We do not host, mirror, patch or repackage this software in any way.
Avoid third-party "download manager" sites offering Comodo Firewall. They commonly wrap the genuine installer in their own bundler, which is how adware and browser hijackers get onto a machine that the user believed was clean.
Alternatives to Comodo Firewall
Other free security software worth comparing before you decide:
ZoneAlarm Free Firewall
Long-standing free two-way firewall for Windows.
GlassWire
Network monitor and firewall with visual traffic graphs.
Frequently asked questions
Is Comodo Firewall really free?
Yes, the standalone firewall is free for personal use with no trial period.
Does Comodo Firewall replace antivirus software?
No, it's a firewall focused on network traffic and application control; for malware scanning you'd want antivirus software, or the combined free Comodo Internet Security suite which bundles both.
Will Comodo Firewall conflict with Windows Defender Firewall?
Installing Comodo Firewall typically disables Windows Defender Firewall automatically to avoid conflicts, similar to how antivirus replacements work.
Does Comodo Firewall show a lot of pop-up alerts?
It can, especially right after installation while it learns which programs you trust; alert frequency drops once you've set rules for your commonly used apps.
What is Comodo's sandbox feature?
It runs unrecognized or untrusted programs in an isolated virtual environment so any changes they make don't affect your actual system.
Tell us what went wrong — a person reads every message and replies. Corrections to this page are treated as priority fixes.
People also search for
The terms visitors use to find this page. Each one lands here because it describes the same program.
Searches from India
Comodo Firewall is identical worldwide — these are search phrasings, not different downloads. Every one of them gets the same official build from www.comodo.com.
