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  • Manages traffic on your PC
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CNET Editors' Choice, 5-Star Rated

Comodo Free Firewall Pro introduces the next evolution in computer security: Default Deny Protection (DDP™). What is DDP? Most security programs maintain a list of known malware, and use that list to decide which applications and files shouldn't access a PC. The problem here is obvious. What if the list of malware is missing some entries, or isn't up to date?

Default Deny Protection (DDP™) fixes this problem to ensure complete security. The firewall software references a list of over two million known PC-friendly applications. If a file that is not on this safe-list knocks on your PC's door, the best free Firewall immediately alerts you to the possibility of attacking malware. All this occurs before the malware infects your computer. It's prevention-based security, the only way to keep PCs totally safe.

Release Details:

Please see the latest release notes

CNET Editors' Choice

5 Top Secrets Why Comodo Firewall Software is Different?

  • No complex configuration Issues — perfect for amateur users
  • Quickly learns user behavior to deliver personalized protection
  • A user-friendly, attractive graphical interface
  • Lots of configuration options let techies configure things just as they like
  • Default Deny Protection (DDP™) DDP-based security keeps you informed and PCs safe

Comodo's Best Free Firewall Software Awards:

SI Award Log SI Excellent Award SI Good Choice Award Gold Certified Firewall

Release Details: Please see the latest release notes

Not sure about an upgrade? Get Comodo Firewall Software Protection first!
Get Now $29.99/year

Got more than 1 PC?
Get 3 Licenses for $39.99

System Requirements:

Supported OS: XP 32bit, Vista/Win7/Win8/Win8.1/Win10 32 bit & 64 bit / 152 MB RAM / 400 MB space

User Reviews of Free Firewall Software

Important Free Firewall Software Features

  • Firewall Protection
    Default Deny Protection™

    Makes sure that only known PC-safe applications execute

  • PC Security
    Prevention-based security

    Stops viruses and malware before they access your computer…so it isn't too late to stop them.

  • Sandbox Technology
    Auto Sandbox Technology™

    The sandbox is a virtual operating environment for untrusted programs – ensuring viruses and other malicious software are completely isolated from the rest of your computer

  • Personalized Alerts
    Personalized alerts

    The Comodo Firewall software remembers which software is allowed to operate and changes its alerts accordingly.

  • Cloudbased Analysis
    Cloud-based Behavior Analysis

    Cloud-based behavior analysis system detects zero-day malware INSTANTLY.

  • Cloudbased Whitelisting
    Cloud-based Whitelisting

    Cloud-based whitelisting of trusted publishers easily identifies a safe file and vendor

  • Game Mode
    Game Mode

    Suppresses operations that could interfere with a user's gaming experience such as alerts, virus database updates, or scheduled scans.

  • Application Control
    Application Control

    Provides users with the ability to lock down their PC so only known good applications can run.

  • Automatic Updated
    Automatic updates

    Stay current with the latest protection.

  • Threat Alert
    Precise and specific alert system

    Warnings specify the level and type of possible threat from each source.

  • Configure Easy
    Easy to configure

    Tell the free firewall to scan upon installation and add all current applications to the safe list.

  • Detailed Summary
    Detailed summary screen

    Easily access an at-a-glance snapshot of current security settings

  • User friendly Interface
    Uncluttered, user-friendly interface

    Quickly navigate through the various parts of Comodo Firewall protection without getting lost

  • Security Wizards
    Thorough security "wizards"

    Preset security settings for simple point-and-click setup

  • Comodo Safe List
    Exclusive access to Comodo's "safe-list"

    List of over two million known PC-friendly files and apps. Provides free firewall protection with the knowledge to let safe files and apps run.

  • Training Mode
    'Training Mode' lets Firewall automatically create 'allow' rules

    Comodo Firewall software learns your trusted programs to minimise alerts

Get the most from Firewall with Comodo Internet Security Pro

Not sure about upgrade? Get a Firewall Protection first!
Get Now $29.99/year

Got more than 1 PC?
Get 3 Licenses for $39.99

Firewall Software Frequently Asked Questions

What's a Firewall?

Firewall protection is a batch of security measures for your PC, designed to keep malware, viruses, and hackers at bay.

Sounds like Default Deny is important.

It is. DDP™ grants you, the user, ultimate control of what's granted access to a PC.

Will programs run OK in the Sandbox?

Yes. Applications in the sandbox are run under a carefully selected set of privileges and will write to a virtual file system and registry instead of the real system. This means untrusted (but harmless) applications have the freedom to operate as usual while malicious programs are prevented from accessing or infecting your computer. This provides smoothest and most secure user experience possible. more

How Firewall Works?

Firewall is network security software, programmed to prevent illegal access that travels in and out of a private network. It helps to manage the incoming and outgoing traffic of network that is based on a specific set of protocol. It examines each an every activity and blocks if it does not meet the required security norms. more
But I'm not making every decision, right? I couldn't handle that.

Not at all! Our free firewall software has access to Comodo's safe-list of over two million known PC-friendly applications. When one of them accesses your PC, the firewall won't bother you because there's no reason to worry. more
And how is Comodo Free Firewall software different from the dozens of other firewalls out there?

Our firewall software is the only true firewall protection operating with Default Deny Protection™ technology to ensure your computer's security.

Do programs stay in the Sandbox forever?

No – the sandbox is the first part of a trust decision engine. After an unknown application has been placed in the sandbox, Internet Security will also automatically queue it for submission to Comodo labs where it will be analyzed by our technicians. If it is found to be harmless then it will be added to the global safe list that will be downloaded by all Internet Security users in the next round of updates. Once it is added to the safe list, the application will no longer be run in the sandbox by Internet Security. If it is found to be malicious then it will be added to Comodo's list of malware signatures and will be deleted after the next round of updates. more
OK, but what if a file I don't recognize asks for access?

Our free firewall contains detailed alerts letting you know the severity of the threat, and the type of file asking to execute.

Is it free for business users too?

Yes. However, enterprises looking to implement Internet Security on large networks of workstations would benefit from the centralized management capabilities of Comodo Advanced Endpoint Security.

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Get the most from Firewall with Comodo Internet Security Pro
Product info & Sales & Support:

Make sure to have your order number or subscription information available.

For technical product questions visit our Support Home Page click on the "Submit a Ticket" link and select "Internet Security Support" from the dropdown menu and submit.

Online Help Guide

Check out our Online Help Guide for tips on how to use and configure our products and for detailed technical information.
Go to the Help Guide

Forum & Knowledgebase

Our Forum is populated with fellow Comodo users and developers alike and can quite often be the quickest and friendliest way to find answers to questions that you have.
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