Gizmos Needs You

Gizmo's Freeware is Recruiting

 We are looking for people with skills or interest in the following areas:
 -  Mobile Platform App Reviews for Android and iOS
 -  Windows, Mac and Linux software reviews       Interested? Click here



Best Free Firewall Protection

Other Language?
  Read this article in Spanish
In a Hurry?

  Go straight to the Quick Selection Guide



Firewalls help monitor your system's communication between your network and the Internet to help stop intrusions and attacks. They are particularly useful for controlling the activities of Internet facing applications.

No other freeware product has more of a reputation for causing user angst than a firewall. To find a suitable product may involve a process of trial and error. A firewall should protect while not being too intrusive or too complicated to handle. In this article we give you a selection of what we think is the best free firewall software available today. Our recommendations are made taking into consideration both editors' and site visitors' opinions.

Firewalls come in two flavours; software based and hardware based. To avoid potential conflicts only install one (third-party) software firewall. You can improve protection, however, by using a hardware "firewall" (such as a router) and a software firewall in conjunction. Modern routers usually have a built-in firewall; consult your router documentation for more details.

Basic firewall protection is critical for securing your PC. Simple firewalls (like the default Windows firewall) limit access to your system and personal information, and silently protect you from inbound threats. We review basic third-party firewalls that have marginally better security than the Windows firewall, such as simpler features for monitoring programs that request outgoing Internet connections (we call this "outbound protection"). The default Windows firewall has only limited outbound protection.

Proactive firewalls have the most extended protection, including HIPS or program monitoring (HIPS Explained), and watch for malicious behavior before malware gets a chance to take control of your PC or turn it into a botnet drone. They seek to achieve stronger "2-way" protection, preventing programs from broadcasting your personal information to the Internet.

Some kinds of malware are best detected by their behavior, so a proactive firewall (or firewall/HIPS combo) is a solid second layer of protection next to your antivirus program. It's an excellent option for high risk users (check out our Security Wizard to see if this includes you). However, it's plausible to argue that a good resident antivirus will stop some malicious threats before they get a chance to make it to the Internet anyway. Many of the top antivirus programs are starting to provide behavioral blocking and extended scanning of network activity.

It's important to use basic or proactive firewall protection, antivirus software for active protection, and safe practices from our "most important advice of all" (Security Wizard) in order to minimize the risk of malware on your PC.

You can "upgrade" (for free!) your security by reading the documentation and learning about proactive firewalls or HIPS programs, or using other protection like least-privileged user accounts and/or Sandboxie or GeSWall.

Review Index

Additional Tips

  • Before installing new resident security products, including antivirus and firewall programs, you may want to make a full drive image. By creating a full drive image you are able to restore your entire computer back to a previous state in the event your system becomes completely unresponsive. Drive imaging allows you to recover from unintentional conflicts as well as severe malware infections. Everyone's system is unique and may have old, latent drivers that may be incompatible with whatever you are installing, causing problems with your system. Windows Vista (Ultimate) and Windows 7 have a built in "Complete PC Backup and Restore" feature, or you can use a free drive imaging program
  • To cleanly uninstall your (third-party) firewall before installing a new one, you may consider using ZSoft Uninstaller to analyze before and after the installation. If you haven't used it on your current firewall, try Revo Uninstaller (or other vendor or Windows uninstaller), check for leftover services and drivers with Autoruns, and restart your computer.
Basic Firewalls



The built-in Windows firewall is a common choice since it passes all inbound tests (both stealth and open port) and doesn't have many popup alerts. It doesn't require installation, so it's not likely to conflict with your other programs. And many average users may not reliably handle the popup alerts of the best firewalls on the market (especially at their max settings).

If you scan clean for malware and you don't want/need the additional features of a third-party firewall, then the Windows firewall could be a practical and useful solution.

Alternatively, you can replace the Windows firewall with a basic third-party firewall for easier control of outbound protection and additional features. Most simple two-way firewalls ask you to allow or deny Internet access for unknown programs. Many automatically allow trustworthy apps and remember your decisions to become silent over time.

First, you can convert a proactive firewall into a basic two-way firewall, making some of the best free firewalls behave with similar silence and protection as ZoneAlarm. Select the following one-click configurations to set them (see the proactive section for more on them):

  • Online Armor Free: Right-click its tray icon > uncheck the "Program Guard". It's a user friendly option for this configuration if it doesn't conflict with your other software.
  • Comodo Internet Security: Right-click its tray icon > set "Defense+" to "disabled". Or select the "Firewall only" configuration during installation. Make sure to enable rule creation in 'firewall behavior settings' (so you can modify program rules later).

Second, additional third-party firewalls behave similar to the basic configurations of proactive firewalls above. ZoneAlarm, for example, has made a comeback with fewer popups and lighter resource use.



Basic Firewall Reviews

ZoneAlarm Free Firewall  is an excellent inbound/outbound OS firewall solution suited for users of every level of experience. ZoneAlarm protects systems from intrusions as well as program access to the web. ZoneAlarm features an easy-to-understand user interface. Users can adjust security settings for their needs to allow for file/printer sharing, public networks, and even turn off the firewall if ever needed. Simple controls in the form of visual slide bars make setting up this firewall a snap. ZoneAlarm offers to help users setup initial program access with a first-run scan of installed software and allows/denies accordingly. This first scan does not always offer accurate access to programs.

Users will have to interact with this firewall for a time after installation to make sure programs needing LAN or internet access are granted proper permissions. Popups are very simple in format offering Deny, Accept, and a checkbox a user can check to make ZoneAlarm remember the decision. Novice users should be able to easily identify the name of the program asking for web access so they can make the appropriate decision.

The Program Control will allow users to set ZoneAlarm for Low, which is a learning mode and no OS firewall protection and limited popups. Or users can choose Medium, which will make programs ask for permission to access the trusted and internet zones. The high setting is not offered in the Free version of ZoneAlarm. The Smart Defense Advisor will help reduce popups by offering settings for programs asking for access, based on the decisions made by other users worldwide. Users can choose whether or not to participate in ZoneAlarm's community defense program. Users can set programs access manually at anytime by going to ZoneAlarm's Program Control and selecting Programs.

Internet Zone controls are divided into the Trusted Zone, used for the local network to share files, printers, etc., and the Internet Zone for communication to/from the web. A simple 3-position format allows users to choose from "No protection" (firewall is off), Medium (Allows file/printer sharing), and High (will allow users to connect to a network but will not allow anyone else to connect to your system). The medium setting is recommended for home networks with more than one system, and for users whose modem requires this setting. The high setting is most recommended for single-system web access (only one computer at home and modem does not require a home network setting), and for public areas such as cafes, restaurants, and hotels (etc.) with wifi.

ZoneAlarm Free offers basic two-way defense, stealth mode, and anti-phishing protection. However, it lacks HIPS or program-to-program protection.

It is worth noting that there have been many negative comments about the latest version of the software, at least from the visitors on our site. Most notably, many features have been removed, and may be regarded as a step down from previous versions. Perhaps something you may want to take into account when choosing a firewall product.


Windows 7 Firewall Control Windows 7 Firewall Control is a good choice for those intending on using the Windows built-in Firewall. Despite its name, the program is compatible with Windows XP and higher. In a nutshell, Windows7FirewallControl allows the user to configure the Windows firewall to block or allow applications from connecting to the internet; it adds better outbound protection configuration to the built-in Firewall. It is based on the Windows Filtering Platform (which is what the built-in firewall is also based on), so unlike most other firewalls it does not install any third party drivers. The user interface is clean and simple, reflecting what this program does (ie. block or allow application access - nothing more).

There are three modes a user can choose from; Normal, DisableAll, or EnableAll. DisableAll disables all applications regardless of program settings, while EnableAll allows all application access (essentially equivalent to switching off the firewall completely). Unless needing to test something specifically, the Normal Mode is the recommended one - applications/programs are allowed or denied access depending on the rules set.

Under the Normal Mode, when a program tries to access the internet for the first time (upon installation of W7 Firewall Control) a window pop-ups with information on what the application is, the publisher, etc (assuming default program settings). You can then allow or disallow access, either permanently or as a one-time basis. Selecting the former option will add the settings permanently to the Programs list, while with the latter option you will have to deal with the pop-up window again on the next launch.

In addition to the window pop-up for new programs, activities that take place (ie. blocked/allowed traffic, etc) are logged and shows up in the bottom right corner of your screen. Both the pop-up window and log activity notification dialogue can be turned on or off at the user's discretion.

That's basically all there is to it. It may get a bit annoying when you first starting using it, since you will have to define the initial rules for all your applications (ie. allow or disallow them); this includes everything from Internet Explorer to your antivirus program. Nevertheless, Windows7FirewallControl allows much greater and easier control over the built-in firewall than what the operating system offers.


Tinywall 2.0 TinyWall is a lightweight firewall solution that works with the built-in Windows Firewall. With no pop-ups to annoy the user, it can be an ideal set-and-forget solution. The installation package is very small, weighing in at just over 1 MB. Installation is a breeze, though there is no option for the user to select where to install the program. After installation, it starts running quietly in the background, as indicated by the tray icon. All the program features can be accessed by clicking once on the tray icon; there is no 'main window' interface. From the pop-up menu, the user can also view and select, among others, the operating mode, total network activity, adding application/process exceptions, and accessing the Firewall Settings dialog.

The Firewall Settings dialog is where the user can manage General settings, such as password protecting the application. An application exceptions section also allows the user to specify applications that are allowed to communicate with the network. There is also a 'Detect' feature where the program will try to detect known applications, or the user can elect to manually add applications. Furthermore, TinyWall is able to recognize associated processes with the same application. For example, if you have a program that has more than one process, adding the first process will result in the program also offering to whitelist the second related process as well. Needless to say this is very useful for those applications that have more than one process.

It should be noted that when adding an exception to the list, the default settings are 'Unrestricted UDP and TCP traffic'. Depending on the nature of the program it may be necessary to restrict it to 'Outgoing only' to offer maximum security.

The special exceptions tab allows the user to specify more advanced settings; specifically, allowing the user to select which system services to allow/block. It is recommended to leave it as is unless there's something you really want to change.

The maintenance tab rounds out the Settings dialog, allowing the user to import/export settings, check for updates manually, and a link to visit the vendor's webpage.

A small, lightweight firewall, TinyWall is a solid choice for those looking for a reliable, low-resource firewall program that does not interfere with the user's computer usage.

Firewalls with Strong HIPS Protection



The following personal firewalls provide excellent network and HIPS protection. Each firewall comes with default settings and shouldn't require much adjustment except for the needs of advanced users.

Firewall products in this section require more time to learn than basic firewalls, in order to get the most out of them. Since firewalls are often praised for their security effectiveness at their max settings, users will likely have lower protection than mentioned by independent testing sources like Matousec. All of the product vendors seek to provide user friendly features, sometimes incorporating reduced levels of protection in their default settings (by decreasing some HIPS monitoring).


Proactive Firewall Reviews

Comodo Firewall is the best choice for users seeking a full featured security suite. This latest release is suitable for both lightly-skilled users (still must have knowledge of installed programs) and technically advanced users. Its robust and active HIPS (or application monitoring feature), called "Defense+", matches or exceeds the security performance of pay products. Comodo allows for much control and customization for the curious or the paranoid.

Comodo includes a "memory firewall" (against buffer overflow attacks) and a light sandbox component to limit the way unknown applications and new software installations affect your computer. The use of sandbox protection limits the negative effects of malware. It maintains a lengthy list of known safe applications, but if an unknown application attempts entry through the firewall, Comodo will deny the application and ask the user what to do. The new release contains user friendly features by default while allowing experienced users to maintain control over ports, protocols, and configurations.

During installation the user has three firewall installation options to choose from:  Firewall Only, and Firewall with Optimum or Maximum Proactive Defense (ie. the Defense+ feature as mentioned earlier). After installation Comodo automatically selects "Safe Mode", which generates numerous popup alerts for applications not in its trusted vendors list (you can browse this list to see if you trust the vendors: go to the Defense+ tab > "Common Tasks" > "View My Trusted Software Vendors"). When you answer "allow" and "remember your answer" to popup alerts for an application, Comodo creates a custom policy for it. Some of its policies are fairly liberal.

In the more liberal "Clean PC Mode", Defense+ automatically treats all applications on your drive as safe (but if any malware is currently hidden on your drive, it too would be considered safe). Applications still receive some minimal monitoring for Comodo's two protected lists ("my protected registry keys" and "my protected COM interfaces") and for running as an executable, or more/less monitoring depending on their custom policy. And new files get sent to a list of files "waiting for your review" in the "Summary" page. Files listed for review will be considered possibly unsafe and will provoke popup messages, as if in Safe Mode, until their custom policies are made.

Comodo limits the frequency of alerts by automatically treating some programs as safe and allowing some applications to access the Internet. You can additionally automate the behavior of Defense+ by one or more of these methods for treating applications as safe:

  • Have it "remember your answer" to all popup alerts when an application first runs, which works for some applications (because some custom policies set this way are close to "trusted" status). But if an application still nags you, click "More Options" in the alert and use the drop down box to select "trusted" or "blocked" (etc.), if available, or set an application to trusted manually ("Defense+" > "Advanced" > "Computer Security Policy" > "Edit..." > "Use a Predefined Policy"), which finally ceases popup alerts and most intrusion prevention for that application.
  • Add files to the lists of "My Own Safe Files" or "My Trusted Software Vendors" in the interface (see the "Defense+" tab), which is most helpful for "Safe Mode" or "Paranoid Mode".
  • Use the "Clean PC Mode" (right-click the tray icon and select it under the "Defense+ Security Level"). But make sure to scan and remove any malware first.

The following guides by Gizmo's Freeware also contain many useful information about Comodo's settings: How to Install Comodo, How to Tame Comodo Defense+ Without Disabling It, and MC's Mini Tutorial.


Online Armor FirewallA solid contender is the free version of Online Armor Free. It has outstanding leak-test and HIPS performance (the HIPS feature is mostly in its "Program Guard"). It has a unique feature called "run safer" that allows you to selectively set risky applications (web browsers, office software, readers/viewers, instant messengers, email or news programs, multimedia software, download managers, etc.) to run as if under a limited user account (go to "Programs" tab > uncheck "Hide Trusted" > highlight a program and click "Run Safer"). It minimizes popup alerts over time with its automatic list of safe programs, your on-demand scans with its safety check wizard, and your responses to popup alerts -- especially in cases where you tell it to remember your decisions and have it treat programs as trustworthy.

Run the wizard and have it search your PC for known programs to allow/block/ask. In this case, Online Armor relies on you to respond to alerts for unknown programs. For the curious or paranoid user, it uses excellent popup messages when it automatically allows a program to connect online and, optionally, when it automatically trusts a program/process to run (these alerts don't require user action and they can be enabled/disabled in the interface with "Options" > "Firewall", and "Programs" > "Options"). For example, I noticed a message when it auto trusted a key logger test, but after I set the tester to untrusted, it gave very informative and detailed security alerts (and then it passed the test and logged the tester in the interface under the "Key Logger" tab, but it only logged the key logger after the test was untrusted). You can even close both its tray tools from its right-click context menu. They are not needed for the firewall and HIPS components to continue running and protecting.


Outpost Screenshots Outpost Firewall Free is a good choice for users who want highly flexible protection without sacrificing usability. It was obviously made with average users in mind, judging by the care taken to simplify alert messages and make it easy to adjust intrusion prevention (or HIPS) monitoring. For example, it remembers your responses to popup alerts without the need to set "trusted" rules (like in Comodo/Online Armor), and like Online Armor it notifies you when it automatically allows an application to access the Internet (especially helpful during the learning phase).

The free version lacks many extras of the pay version, however, such as automatic updates and the ability to break active connections. The HIPS component is called "Host Protection" in the interface. It provides four default levels of protection, which can be easily set with a slider and additionally customized item by item by advanced users. The default "optimal" setting only monitors the "most dangerous activities" (such as memory injections, driver loads, and a healthy list of system critical features -- auto starts, shell extensions, and internet settings) instead of all program activities. But these "optimal" settings lack protection from keyloggers, direct disk accessing, DNS API request monitoring, etc. You can check the types of reduced monitoring in "Settings..." > "Host Protection" > "Customize...".

The installation asks whether you want to train the firewall for a week (using its Auto-Learn mode and Rules Wizard). In this mode, it sets rules automatically for known safe applications.


Private Firewall A former commercial product, Private Firewall is now unrestricted freeware. It is a proactive multi-layer security solution, offering behaviour blocking technology alongside standard firewall protection. Using Behavioral-based Monitoring, it features zero-hour virus, spyware, and malware protection, process and application security, and registry protection, just to name a few. It is definitely a feature-packed firewall/HIPS solution.

 While there is a decent help file available, the user interface can be a bit confusing and overwhelming. There are many configurable settings, and sorting through them may require some time. To help out with that there is a information menu on the right of each screen which explains what each section is for. Training mode allows all actions within a 180-second interval, which is ideal for installing or running programs for the first time. On the first run after installing however, Private Firewall still managed to disable Panda Cloud Antivirus, the antivirus software on my test system, even with Training mode activated. Adding Panda Cloud Antivirus to the allow list seemed to solve this minor issue.

It is also possible to set different security levels for the Internet and the Network. Various levels of protection (High, Low, and Custom) can be separately specified for Internet Access and Network Security (ie. file and printer sharing). This is useful for, say, when one needs to access the internet via a network they don't quite trust. In addition, there are three profiles you can choose: Home, Office, and Remote. You can set appropriate settings for each one and easily switch between them as needed; this is particulary useful for portable computers which connect to many different networks. Another useful feature is that it is possible to block all outbound email; simply click the 'Block Outbound Email' icon in the main user screen and all outbound email should be blocked.

Overall, Private Firewall is a very effective firewall; it ranks among the top products on Matousec. A number of members at our forum speak highly of the developers of Private Firewall, and the software is trusted. However, the graphic interface and usability is slightly tailored for the more advanced users. Beginner computer users may want to consider another firewall instead, but if you are comfortable with the basics of Windows & firewall software, you should definitely consider Private Firewall.


AVS FirewallAVS Firewall differs from other regular ones in that it comes with additional protection modules; namely a registry defender, a banner blocker, and parental control options – it is something like a suite. The firewall itself does not have as many configurable options as some of the firewalls listed on this page, but the standard selections are still there – off, which turns off the firewall; custom, which allows you to set your own connection rules; and high, which blocks all connections.

Each section of the program is displayed clearly; navigation is through the menu on the left. Alerts are generally clear and straightforward, as is configuration.

The registry defender protects the registry from being modified, with the option of only protecting select categories. The parental control limits the list of websites that can be accessed, but you must manually add each website to be trusted, ie. You cannot block specific websites; you can only allow certain websites. The anti-banner component blocks undesirable web page content including ads, flash banners, pop-ups and the like. All three of these additional modules can be disabled independently as desired. AVS Firewall also comes with a monitoring utility so you can check the size of network traffic which is sent and received by each application.

During installation of this firewall, the installer automatically installs the AVS Software Browser; there is no option to opt-out of installing this, but the program can be removed separately after installation with no effect on the actual firewall program. The installer also has a pre-checked option to install AVS Registry Cleaner, and it is recommended that it is unchecked so the installer does not install it.

Despite trying to bundle in a few additional programs by the vendor, AVS Firewall itself is a decent firewall program.  It has some additional features not found in your everyday firewall program, though most of those features can be found in other third party programs.


Other Firewalls for Windows 95-2000
Related Products and Links


Related to Firewalls

Security Guides

Security Products

Inbound Vulnerability Tests

Outbound Vulnerability Tests

Learn More

Quick Selection Guide - Basic Firewalls

Windows 7 Firewall Control
Runs as a stand-alone program on a user's computer
Simple and effective; uses Window's built-in firewall platform so no third party kernel drivers are needed. Very small footprint. Three modes to choose from (Normal, EnableAll or DisableAll). Great for complementing Windows' built-in firewall
May be a bit annoying to use at first since the user must configure the initial rules for all their applications; no training mode. The dialog box that pops up to allow/disallow a particular program has a lot of information, some of which may not be too user friendly to beginner computer users. Online manual could be more comprehensive.
1.43 MB
32 and 64 bit versions available
Feature limited freeware
A portable version of this product is available from the developer.
Windows XP, Server 2003, Vista, 7, Server 2008

Despite its name, this program works with system Windows XP and higher

Runs as a stand-alone program on a user's computer
Lightweight basic firewall; simple yet effective. Non-intrusive program with no pop-ups. Ability to recognize associated processes when whitelisting programs. This program could be a good choice for those not familar with computers, as it does not require advanced knowledge to use.
No user dialog; everything is accessed from the pop-up menu. Not necessarily a bad thing, but may be different compared to what most are used to. Cannot select where to install the program. Requires .NET framework
32 and 64 bit versions available
Unrestricted freeware
There is no portable version of this product available.
Windows 7, Vista
ZoneAlarm Free Firewall
Runs as a stand-alone program on a user's computer
Solid inbound firewall, stealth mode, user friendly, customizable settings, anti-phishing protection, and hosts file lock.
Inadequate HIPS or program monitoring protection. No High setting for program access in Free version. In spite of available automatic update option, updates almost always must be performed manually. Help file designed for commercial version. New version (v10) has received negative feedback from our visitors
32 bit but 64 bit compatible
Free for private use only
There is no portable version of this product available.
Windows XP (32-bit), Vista, Windows 7 (2 GB RAM, 2 GHz, 100 MB disk space)

To learn more visit its service and support page

Quick Selection Guide - Firewalls with HIPS

Gizmo's Freeware award as the best product in its class!

Runs as a stand-alone program on a user's computer
Effective proactive security and stealth, one of the lightest of all tested firewalls on memory, simple setup (no nags or ads!). Easily choose between 3 network profiles. Has a unique "email/system anomaly detection" feature, which trains over 7 days by default. Quick to respond to queries / feature requests.
No automatic installation mode (but it has a training mode in "Settings" > "Advanced"). The tray icon flashes for log events instead of network activity per se. Program may be more suitable for advanced users due to slightly complex user interface.
32 bit but 64 bit compatible
Unrestricted freeware
There is no portable version of this product available.
XP & Server 2003 (32-bit), Vista, Windows 7 (128 MB RAM, 300 MHz, 10 MB disk space)

Additional Features of Interest (as Found in its Interface): Built-in help and tips. Auto trusts safe vendors. Able to block outbound email automatically. Network options for experts, with three default settings to modify (Home, Public, Work).

To learn more visit its feature list and online support (change log, user guide, & tutorials).

Comodo Firewall
Runs as a stand-alone program on a user's computer
Its Defense+ HIPS performance exceeds commercial products and leads the class, it includes a "memory firewall" feature, and it allows you to quickly switch between Defense+ security modes and configurations. Includes automatic updates. Installation can automatically configure your PC to use the Comodo SecureDNS (but you can do this without installing CIS).
No built-in help. Despite not installing the AV component, the AV files are still placed in the Comodo program folder. Possible problems when uninstalling program; remants of the program are sometimes left
88 MB
32 and 64 bit versions available
Unrestricted freeware
There is no portable version of this product available.
Windows XP (SP2), Vista, Windows 7 - 152 MB RAM, 400 MB disk space

Additional Features of Interest (as Found in its Interface): Installation mode/training mode, auto updating, built-in help and tips, parental control with password protection, extra themes and languages, and a stealth ports wizard. Purges old or unused firewall/Defense+ policies or unused files (safe files, files waiting for review, etc.). Displays balloon messages for instant logging events.

To learn more visit its forum, online help, and/or release notes.

Outpost Firewall Free
Runs as a stand-alone program on a user's computer
Proactive security (at max settings) compares with Online Armor. Highly flexible protection, simplified alert messages, and includes a full screen mode.
It fails tests for protection against malicious logouts or system shutdowns. The free version lacks automatic updates and the ability to break active connections.
2009 - v6.51
16.63 MB; 98.81 MB for Security Suite
32 and 64 bit versions available
Feature limited freeware
There is no portable version of this product available.
Windows 7, Vista, XP - 450 MHz CPU, 256 MB RAM, 200 MB free disk space

Newer versions and 64-bit version are part of the Outpost Free Security Suite - includes additional software components which may conflict with existing software.
64-bit version (98.81 MB v7.1) available here: *Warning: Downloads from Cnet ( now require the use of a proprietary installer.

Reduced HIPS monitoring (lacking anti-key logger protection for example)

Additional Features of Interest (as Found in its Interface): Built-in "Help", full screen mode or entertainment mode.

Online Armor Free
Runs as a stand-alone program on a user's computer
Excellent proactive security performance. Includes a "run safer" feature to reduce rights for specific risky applications, and the ability to monitor key logger activity and host files. It handles the installation of new programs better than some other tested products.
It doesn't have automatic updates or a built-in help. It's mandatory to enter an email during installation, and it has a pre-checked option to send it anonymous information. May have problems installing unless all remnants of similar programs have been removed from the receiving computer.
30 MB
32 bit but 64 bit compatible
Free for private use only
There is no portable version of this product available.
Windows XP (32-bit), Vista (32-bit), 7; 512MB Ram, 50MB Disk space

64-bit version only for Windows 7; XP 64bit and Vista 64bit are not supported

Additional Features of Interest (as Found in its Interface): Set passwords, protect programs (right-click > "Advanced options"), key Loggers tab/Hosts tab, and multi desktop support.

To learn more visit its forum, and blog.

AVS Firewall
Runs as a stand-alone program on a user's computer
Has additional features not found in standard firewalls (registry defender, banner blocker, parental controls). Clear and straightforward navigation. Easy to configure
Parental control only allows you to add trusted sites; you cannot specify specific sites to block. Installer automatically installs AVS Software Browser which is not necessary for the firewall program, and has pre-checked option to install the vendor's Registry Cleaner. Firewall itself is not as configurable as others
32 bit only
Unrestricted freeware
There is no portable version of this product available.
Windows 7, XP, 2003, Vista

Have Your Say

Your opinion matters! If you've used one of these firewalls before, or know of another outstanding freeware firewall, let us know in the comments section below. For a more comprehensive discussion, please visit our forum.


This software category is maintained by volunteer editor Tim; registered site visitors can contact Tim by clicking here 

best free firewall software reviews Windows firewalls HIPS

Back to the top of the article

Share this
Average: 4.3 (469 votes)
Your rating: None


by Anonymous on 17. April 2008 - 17:41  (72)

HI - I hate firewalls as an elderly lady surfer I have found them difficult to configure in the past but I put Online Armour on no problems no issues and what is more I understood what I was doing - this is good for the non-geeks among us

by Anonymous on 17. April 2008 - 19:42  (78)

The latest leak tests show that Kerio does not come anywhere near Online Armor in terms of protection against intruders. Even Scott (of Scott`s newsletter fame) has declared Online Armor to be the best available firewall after a gruelling research that has spawned many months. It has integrated HIPS protection as well. It is also free from the unstability reports of Comodo. I think that in the view of the latest leak tests, this article needs a major overhaul.

by Anonymous on 18. April 2008 - 5:48  (102)

Scot recommends the paid version of OA ($39,95). Not the free one (AFAIK)

by Anonymous on 18. April 2008 - 16:16  (123)

I have been using jetico for some years now, and I still have no idea how to re-configure it when I encounter a problem. That aside, it works extremely well and has always kept me safe. The feature I like the best is the two little arrows that sit quietly in the tray, lighting up green and red to show both allowed and blocked traffic in both directions. In fact I like this feature so much, that I would not consider changing for one that does not have this.

by Anonymous on 19. April 2008 - 10:36  (145)

The problem With updating Online Armor free is not automation. When a new version is installed manually it does not retain the rules so all the setup has to be made from scratch

by Anonymous on 19. April 2008 - 23:21  (168)

Since our small home network sits behind a $10-after-rebate hardware router, we have considerably less need for a software firewall (I'm not sure that we've *ever* had one detect any in-coming threats). So to check on out-bound activity we've just run ZA 5.5 on our Win98SE systems (6.0/6.1 having had some reputation for problems), save for my recent attempt to install it on a new K8M890 AM2 motherboard which didn't like it for some reason; I did try Jetico, but quickly got annoyed with being asked whether to allow virtually every process network access (even Blank Screen.scr, for heaven's sake - which I'm reasonably certain doesn't use it) - and it may have had the same GPF problem on the K8M890 anyway.

We've been happy with Comodo on our Win2K systems, save for the fact that Comodo development for that platform stopped a while ago. I did successfully install Online Armor on one new system but haven't used it much yet - I like the fact that it's apparently still developed for Win2K, its ability to limit browser rights (if indeed that's included in the free version - haven't checked that yet), and the possibility that it might make an auxiliary HIPS product redundant (not that we're unhappy with ThreatFire).

Last time I checked it looked as if NetVeda development was moribund, but I guess it revived sufficiently to get out another . release last year. Some people have reported less-than-stellar support, though.

- bill

by Anonymous on 22. April 2008 - 20:47  (232)

I have had issues with Comodo now on 2 computers - I install it, then when it says the computer must reboot to complete installation, the computer freezes on a black screen (with only the mouse visible) partially into the Windows boot-up. I thought it was perhaps just my old computer (5 years old now), but it did the exact same thing on by brand new Inspiron 530 quad-core machine as well. I had to go in safe-mode and uninstall the product, which returned both machines to their normal flawless boot-ups. Don't know what I'm doing wrong, but it's enough to push me to one of these others listed here. Thanks for providing your recommendations for those of us who have no idea what half the tech-stuff you guys say actually means!

by Anonymous on 24. April 2008 - 7:05  (250)

Sunbelt is good ONLY IF you are not running server program like Apache, PWS, or webcam server. If you run it with Sunbelt installed, you will often see the ugly BSOD screen.

by Anonymous on 27. April 2008 - 11:13  (280)

The firewall leak test sites that I'm aware of are here:

by morrig on 27. April 2008 - 11:30  (281)

Just wandering if you have a conflict occurring with software you have on both computers as I am on XP SP3 running on Comodo Beta with no problems,with AVG 8.100 and Spywareblaster ,Spybot search and destroy.

by morrig on 27. April 2008 - 11:38  (282)

Any guys needing to leaktest use this---

by Anonymous on 28. April 2008 - 5:43  (288)

Online Armor Personal Firewall, the freeware version has been great for me and easy to use!

by tuxster on 1. May 2008 - 10:35  (310)

I have also had problems with Comodo. When I install it on my computer, the boot up essentially freezes (it really doesn't freeze, but takes close to 25 minutes! I tried it a few times just to make sure).  I have been unable to figure out what might be causing the conflict, as I really don't have patience to reboot multiple times when it's that slow. (I'm running a Thinkpad T60 with Norton Antivirus Corporate, Spybot Seek&Destroy, and a bunch of non-security related utilities).

by chris.p on 10. May 2008 - 15:33  (376)

Hi tuxster,

I think you should start by uninstalling any and all N*rt*n applications; they are well known for this sort of problem, so it makes sense to look at this area first.

Please take a look around this site for the top antivirus programs recommended - many people have done a great deal of work, bringing you that information. You can certainly find freeware solutions that will outperform your current AV & AS set-up by a very large margin.


by chris.p on 10. May 2008 - 15:48  (377)


I'm sure you're correct. However, the editor's job here is not to review server firewalls, which are a totally different sphere. I'd be interested to know, actually, if there are any freeware server firewalls?

I'm a user of Sunbelt KPF and I have to say that, in the very large number of installations I've done, it worked better for me than Agnitum Outpost or ZA. Outpost is too complex for the average user (to be honest it's too complex for me), and as stated, ZA free has some serious drawbacks. ZA commercial is an interesting prospect for debate ;-)

Steve Gibson is a well-known character of course; perhaps not always on the side of the angels, but always worth listening to.

Don't know if his GRC leak-test is still running; worth adding to the leak-testing inventory if it is. OK, some drawbacks there, but you should remember that it was he who exposed the deceptions at BlackIce Defender (a lot of people mistakenly thought that was a great firewall at the time, but it was no better than WinXP's of course); and virtually him alone who promoted leak-testing to the masses in the first place.


by Anonymous on 10. May 2008 - 15:56  (378)

Hi kat,

Like your reviews. Reckon they're spot-on, at least as far as the apps I know are concerned. Some very useful info here on ones I never heard of, as well.

I answered a comment lower down about server firewalls - know any free ones?

Had to post this as 'anonymous' since the CMS doesn't give you a 'New Post' button if you're logged in. Eh? Must look into that!

Keep it up,


by Anonymous on 11. May 2008 - 8:46  (387)

Ports 135-139 are some of the most exploited ports and are recommended to be PERMANENTLY closed by every security guy.(except if you need file&printer sharing.) Online Armor Personal Firewall, the freeware version. was allowing all outside requests to these ports when I used it. and configuration was disabled so I changed my firewall to comodo which I hear has passed all known leakproof tests.

by Anonymous on 13. May 2008 - 2:34  (430)

yeah i couldnt agree more with the one comment,,iv tried all the ones listed here ,and then some..and online armor is the best so far overall!only thing its missing is the web sheild and mail sheild in the free version but i have other programs to handle that, like avast 4.8 and terminator,,so as far as firewall goes you can't go wrong with online armor thats for sure,,,4.7 out of 5.0 stars!!!
IT,over 18 years exp,

by Anonymous on 15. May 2008 - 13:50  (519)

This is one of the few freeware security sections that is led by a guy who at least knows what is out there (not surprising if this is the kat i'm thinking of).

The rest of the best "freeware" security are listing outdated, dead apps that people have long moved away from...

by Anonymous on 15. May 2008 - 17:05  (527)

What do you think of OUTPOST Firewall Free?

by Anonymous on 16. May 2008 - 2:53  (542)

Post in Comodo's forum, I am sure they want to know about these things... they need feedback to improve.
I am using it on 2 computers, plus my cousin's computer, and I have not had any problem (well, I had a lot of annoying warning messages the first days, because I didnt read the tips to avoid that problem).

by Anonymous on 17. May 2008 - 2:01  (667)

What I'm using now for a firewall and such is probably not the best but it seems to cause the least problems with my computers anyway. I'm using PC Tools firewall, PC Tools Spyware Doctor lite, PC Tools Antivirus free and PC Tools Threatfire free. Hopefully since they are all from the same company they should work and play well with each other. I haven't had any problems so far.

by Anonymous on 20. May 2008 - 6:51  (817)

Zone Alarm was pretty good on XP but it keeps giving me the BSOD on Vista even with the latest update.

by Anonymous on 20. May 2008 - 8:29  (821)

I installed Online Armor and my PC slowed ... extra time to load up word etc and most definitely affected internet browsing. Now trying Sunbelt and I'm back to normal load times.

by Anonymous on 20. May 2008 - 11:31  (824)

i can tell you now the leak tests and the product are superior! - get Tall Emu's online armor now, i use the free edition and it is seriously cutting down attacks to my windows machine, and NO it doesnt run slow or slow down my PC!.

you might want to try cleaning your computer a bit better 1st before saying that this product is the problem, believe me online armor is the best free firewall for windows you can get your hands on NO BS.

get used to it , use it properly and keep it updated it wont let you down !.

happy computing!

by Anonymous on 21. May 2008 - 8:37  (868)

don't worry, my machine is kept clean. before online armor, running great, installed and a big slow-down. as soon as i uninstalled and installed sunbelt it was running great again.

i'm not doubting the products ability, but for me, it made my machine unusable.

by Anonymous on 22. May 2008 - 2:58  (924)

On my network Jetico is the only one that works. Zone Alarm and Comodo did not. Net Veda would not allow me to reregister.

It works fine but is a bit intrusive and has to be shutdown during some downloads.

by Anonymous on 24. May 2008 - 1:27  (1044)

i can double what u say..
my computer boots longer,and occasionally i get huge slow-down bursts..
all happened when i installed online armor...
as good and nice else, as it feels..
if this continues,i'm gonna uninstall it and switch back to comodo.. no such probs with it..

by Anonymous on 24. May 2008 - 14:19  (1070)

free Jettico V1 is for W98/ME/NT - Jettico V2 for XP and Vista but no longer free...:o(

by NYNE on 26. May 2008 - 3:33  (1153)

webroot personal firewall is another alternative to look into. although one downside is that you have to register the product to receive a serial. ive ran it for some time now and the interface seems similar to zone alarm. ive tested with the basic test located at and a few other leak test from matousec firewall testing (where comodo and online armor both posted in the top 5 for the test that matousec puts them through) i must admit though these test are alot more intrusive than the average pc user needs to be concerned with. Thus my recommendation for webroot personal firewall. after the install it goes into learning mode to become familiar with your current port activities then sets rules but also allows the user to set rules aswell. it is very user friendly and should be looked into by anyone seeking a strong yet user friendly firewall