What is persfw.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the persfw.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Persfw.exe file information

Windows Task Manager with persfw
Persfw.exe process in Windows Task Manager

The process known as Kerio Personal Firewall Engine or Tiny Personal Firewall Engine belongs to software Kerio Personal Firewall or Tiny Personal Firewall by Tiny Software ( or Kerio Technologies (

Description: Persfw.exe is not essential for the Windows OS and causes relatively few problems. The file persfw.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 389,120 bytes (57% of all occurrences), 421,888 bytes or 655,360 bytes. 
There is an icon for this program on the taskbar next to the clock. The application uses ports to connect to or from a LAN or the Internet. It is not a Windows core file. The program has no visible window. Persfw.exe is able to record keyboard and mouse inputs, hide itself and monitor applications. Therefore the technical security rating is 43% dangerous, however you should also read the user reviews.

Recommended: Identify persfw.exe related errors

If persfw.exe is located in a subfolder of C:\, the security rating is 58% dangerous. The file size is 421,888 bytes. The program is not visible. There is no detailed description of this service. The application listens for or sends data on open ports to a LAN or the Internet. It is not a Windows system file. Persfw.exe is able to record keyboard and mouse inputs and hide itself.

External information from Paul Collins:
There are different files with the same name:

Important: Some malware camouflages itself as persfw.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the persfw.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Deutsche Telekom Treiber
Tiny Personal Firewall blocks the network traffic based on protocol, ports and application.
  Matthias   (further information)
Firewall Kerio
It's a free personal firewall.
Kerio Personal Firewall
Very simple and efective firewall
Great little free personal firewall, have used it for years without problem
something that has made me close a window at boot-up since it was installed... a pest
  Taylor   (further information)

Rating chart

Summary: Average user rating of persfw.exe: based on 11 votes with 8 user comments. 8 users think persfw.exe is essential for Windows or an installed application. One user thinks it's probably harmless. 2 users think it's neither essential nor dangerous.

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Best practices for resolving persfw issues

A clean and tidy computer is the key requirement for avoiding problems with persfw. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the persfw.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

persfw.exe [all]