What is fwdrv?

Fwdrv.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if fwdrv.sys is a Windows system file or if it belongs to an application that you can trust.

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Fwdrv.sys file information

The process known as Sunbelt Personal Firewall FWDRV belongs to software Sunbelt Personal Firewall or Kerio Personal Firewall Driver or Firewall Driver by Sunbelt Software ( or Kerio Technologies (

Description: Fwdrv.sys is not essential for the Windows OS and causes relatively few problems. Fwdrv.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 302,000 bytes (18% of all occurrences), 102,912 bytes and 7 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. The service has no detailed description. Fwdrv.sys is not a Windows system file. There is no description of the program. You can uninstall this program in the Control Panel. fwdrv.sys appears to be a compressed file. Therefore the technical security rating is 34% dangerous; however you should also read the user reviews.

Uninstalling this variant: If problems with Kerio Personal Firewall or Sunbelt Personal Firewall come up, you could completely remove it (Control Panel ⇒ Uninstall a Program).

Recommended: Identify fwdrv.sys related errors

Important: Some malware disguises itself as fwdrv.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the fwdrv.sys 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

seems to belong to Keiro Firewall
Kerio Personal Trojan... erm, Firewall ;)
  custo   (further information)
Used by Tiny Personal firewall as well. Sometimes causes BSOD when doing kernel debugging though...
Kerio Firewall
it belongs to Kerio Firewall
it doesn't run as a service, Kerio Personal Firewall hooks into it (via \Device\FWDRV) and it hooks into certain operating functions relating to process starting/suspending/stopping and file writing
Used by Kerio Firewall - can cause Blue Screen of Death
Firewall related sys file.
Belongs to Kerio , VirusTotal detection rate: 0/42 ; Malwarebytes : result clean ;
Firewall driver from Kerio. This is SAFE !

Rating chart

Summary: Average user rating of fwdrv.sys: based on 16 votes with 10 user comments. 9 users think fwdrv.sys is essential for Windows or an installed application. 5 users think it's probably harmless. 2 users think it's neither essential nor dangerous.

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Best practices for resolving fwdrv issues

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

fwdrv.sys [all]