4 Best Free Portable Firewall Software For Windows

Here is a list of best free portable firewall software for Windows. As these are portable firewall software, thus you can use them on the go without actually installing them on your system. The working of these software is similar to standard firewall software through which you can restrict network access of applications and processes. These software use inbuilt rules to restrict certain programs and qualify other programs to access the internet. However, these software also let you create new or edit existing rules according to your requirements. Besides this, you can also manually block or unblock certain apps, programs, and processes from accessing the network. In some software, you can also create a whitelist consisting of those programs that you don’t want to get affected by these firewall software in any way.

Through some of these software, you can also monitor apps and programs which are using the network in real-time. Along with network connection status, you can also track remote addresses, local port numbers, protocols, etc. In some software, you also get block all feature to block all applications and programs from accessing the internet. Similar to block all feature, a Block Internet feature is also present in some software that disables the internet in your system. In general, all of these firewall software are very capable of filtering out network traffic. Go through the list to know more about these software.

My Favorite Portable Firewall Software For Windows:

SterJo NetStalker is my favorite software because it lets you track as well as block applications and processes from accessing the network. Plus, it allows you to add custom filtering rules to filter out network traffic. It also offers multiple filtering modes to change the behavior of network traffic filtering.

You can also check out lists of best free Firewall, Portable Antivirus, and Portable PDF Reader software for Windows.

SterJo NetStalker

SterJo NetStalker is a free portable firewall software for Windows. It comes in both installer and portable versions. Using this software, you can monitor all the apps, processes, and programs which are accessing the network. At any time, you can block any app or program from accessing the internet. It also helps you detect the suspicious processes which are using the network by showing a popup window from where you can immediately terminate its connection with the internet. Let’s take a look at the main features of this software.

Main Features:

• Filter: This feature offers three types of filter modes to control the network access namely No Filter, Filter Traffic, and Block All Traffic.
  • The No Filter mode allows unrestricted access to both incoming and outgoing network traffic. Plus, it does not restrict any application or program to access the network.
  • The Filter Traffic mode filter network traffic and restricts apps and process which are not following the rules defined in this software. This mode also shows a popup whenever it detects a new connection to the network.
  • The Block All Traffic mode blocks all the incoming and outgoing network traffic and terminates the connection of process with the network. Besides three filter modes, it also offers a pause monitoring feature to stop this software from monitoring your network.
• New Rule: Using it, you can manually create new rules according to which this software can monitor and block access to process and application from accessing the network. To create a new rule, you need to specify its description, remote address (remote or simple address), and remote port (remote port or any port) parameters. You can also save the policies locally in .rlsp file format.
• Activity: In it, you can view all the processes and applications with their remote address, local port numbers, protocols, and network access status (listening, time_wait, established). From here, you can also manually select any process and close its connection with the network, kill the process, or create a new rule for that process.

Additional Feature:

• Policy Tab: In this tab, you can view all the applied policies. Plus, it lets you edit and delete the policies if needed.

Final Thoughts:

It is one of the best free portable firewall through which you can easily monitor and restrict network traffic.

simplewall

simplewall is another free open source and portable firewall software for Windows. It comes in both portable and executable packages which you can get from its official website. It is also an extremely lightweight firewall software that you can use on the go. Through this software, you can monitor as well as restrict network traffic. Now, check out the main features of this software.

Main Features:

• Apps, Services, and Packages: In these tabs, you can view all the apps, services, and packages that are using the network. From there tabs, you can select and disable any app, service, or package from accessing the network.
• Enable Filters: By using this feature, you can immediately start the network traffic filtering according to the predefined or newly added rules.
• Create Rule: Through this feature, you can create custom rules for both incoming and outgoing network traffic. To create rules, you need to specify parameters like Rule type (remote or local), Direction (Outbound or Inbound), Protocol (ICMP, IGMP, UDP, TCP, etc.), Action (allow or block), etc.
• System Rule: It is a tab that shows all the enabled and disabled system rules like NetBIOS, UPnP, SSDP, NTP, SNMP, etc. From here, you can also enable or disable any rule that you want.
• User Rules: It shows all the user-defined rules that you can enable or diable in just one click.

Additional Features:

• Blocklist: It lets you block Microsoft server services namely Microsoft spying and telemetry servers, Microsoft update servers, and Microsoft applications servers.
• Import and Export: In this software, you also import and export settings and rules in the form of XML file format.

Final Thoughts:

It is another good portable firewall software through which you can easily filter out network traffic of your system.

Firewall App Blocker

Firewall App Blocker is yet another free portable firewall for Windows. Using it, you can easily restrict apps and services from accessing the network. To block programs to access the internet, you can directly drag and drop the program to its interface. Besides this, you can also add inbound and outbound rules in it to filter both the incoming and outgoing traffic.

Main Features:

• Outbound and Inbound Rules sections: In these sections, you can add those applications which you want to block during the incoming and outgoing network traffic. It also offers tools to unlock added apps if you want.
• Whitelist: In it, you can add those programs which you don’t want to affect during the network filtering by this software.
• Firewall Settings: Use it, to add new inbound, outbound, and connection security rules.

Additional Features:

• Block Internet: It is a handy feature through which you can completely disable the internet in your system.
• Import and Export: Use these features to import and export configuration settings in the form of INI files.

Final Thoughts:

It is another impressive portable firewall software through which you can easily filter out both the incoming and outgoing network traffic.

PeerBlock

PeerBlock is one more free open source and portable firewall software for Windows. Using this software, you can protect your system from servers with bad reputations. At any time, you can block communication of your system with one or more servers in just one click. Plus, it can also be used to monitor P2P activities. Now, check out the main features of this software.

Main Features:

• Protection: From this tab, you can enable or disable HTTP in just one click. It also shows the names of all the blocked servers along with their source address, destination address, and protocol.
• Port Settings: Using it, you can enable certain ports for communication such as 80, 443 (HTTP, HTTPS), 21 (FTP transfer), 25 (SMTP), 110 (POP3), etc. Plus, options to manually add more ports is also available in it.

Additional Features:

• Settings: From here, you can specify colors for blocked and unblocked connections. Plus, you can enable notifications when HTTP connections get blocked by this firewall software.
• History: In it, you can view the history of blocked as well as unblocked connections.

Final Thoughts:

It is an easy to use portable firewall software that you can use to protect your system from unsafe connections.