here is one explanation at
http://www.file.net/process/kpf4ss.exe.html
kpf4ss.exe file information
The process
Kerio Personal Firewall 4 - Service or Sunbelt Kerio Personal Firewall 4 - Service or Sunbelt Kerio Firewall Service or Sunbelt Firewall Service belongs to the software
Kerio Personal Firewall or Sunbelt Kerio Personal Firewall or Sunbelt Personal Firewall by
Kerio Technologies (
www.kerio.com) or
Sunbelt Software.
Description: kpf4ss.exe is located in a subfolder of "C:\Program Files" - typically
C:\Program Files\Kerio\Personal Firewall 4\. Known file sizes on Windows XP are 1,617,920 bytes (31% of all occurrence), 1,368,064 bytes, 1,234,480 bytes, 1,941,504 bytes, 1,630,208 bytes, 1,205,784 bytes, 1,167,360 bytes, 1,912,832 bytes, 1,222,192 bytes.
The program is not visible. Program listens for or sends data on open ports to LAN or 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
41% dangerous, however also read the users reviews.
looks like a firewall program....did you install kerio recently?