What is kpf4ss.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 kpf4ss.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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Kpf4ss.exe file information

Windows Task Manager with kpf4ss
Kpf4ss.exe process in Windows Task Manager

The process known as Kerio Personal Firewall (version 4 - Service) or Sunbelt Firewall Service or Sunbelt Kerio Firewall Service or Sunbelt Kerio Personal Firewall (version 4 - Service)

belongs to software Sunbelt Kerio Personal Firewall (version 4) or Kerio Personal Firewall (version 4) or Sunbelt Personal Firewall

by Sunbelt Software ( or Kerio Technologies (

Description: Kpf4ss.exe is not essential for the Windows OS and causes relatively few problems. Kpf4ss.exe is located in a subfolder of "C:\Program Files"—typically C:\Program Files\Kerio\Personal Firewall 4\. Known file sizes on Windows 10/8/7/XP are 1,234,480 bytes (31% of all occurrences), 1,617,920 bytes and 6 more variants. 
The program is not visible. The software listens for or sends data on open ports to a LAN or the Internet. It is not a Windows system file. The application can be uninstalled in the Control Panel. Kpf4ss.exe is able to hide itself. Therefore the technical security rating is 40% dangerous; however you should also read the user reviews.

Uninstalling this variant: If problems with Kerio Personal Firewall or Sunbelt Kerio Personal Firewall come up, you can do the following:

Recommended: Identify kpf4ss.exe related errors

Important: Some malware camouflages itself as kpf4ss.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the kpf4ss.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

Its the service for Kerio Firewall
  Prometeo   (further information)
kerio personal firewall
  Deniz Oguz   (further information)
That is eating up my PC's CPU time, average 98%, and slowing down all applications. Everything seems to work fine without it except for Kerio Personal Firewall 4.
It is Kerio Firewall, awesome protection, I love it!
i have had this firewall now for several month and it is the lower version of kerio i have had no problems with it However the payed version will give protection like you never saw beforeAND ONLY YOU WILL DECIDE WHAT WILL HAPPEN ON YOUR PC
Kerio Personal Firewall
It is the Kerio Personal Firewall program. needs to be restarted several times a day otherwise it eats up CPU resources
  Peter Munro  
Kerio Personal Firewall, It eats up a lot of CPU for me, but also supposed to protect from viruses.
Kerio firewall - restricts downloads to 100KBps for unknown reasons, so disable it for big stuff.

Rating chart

Summary: Average user rating of kpf4ss.exe: based on 18 votes with 10 user comments. 13 users think kpf4ss.exe is essential for Windows or an installed application. 3 users think it's probably harmless. 2 users suspect danger. One user is not sure about it.

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Best practices for resolving kpf4ss issues

A clean and tidy computer is the key requirement for avoiding problems with kpf4ss. 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 kpf4ss.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

kpf4ss.exe [all]