What is filtnt?

The genuine filtnt.sys file is a software component of Agnitum Outpost Firewall Pro by Agnitum.
Filtnt.sys is a filter driver for Agnitum Outpost Firewall Pro, a security software that provides a secure firewall and protects systems from incoming targeted attacks. A filter driver is a software program that adds functionality to peripheral devices. It can even add support for a specialized device in the computer. This file is not a critical Windows component and should be removed if known to cause problems. Agnitum Outpost Firewall Pro features filtering network traffic and provides protection from various kinds of threats such as hackers, data leaks, malware, etc. The program also blacklists malicious websites, blocks harmful content and automatically encrypts IDs and passwords. Agnitum Ltd is a Russian company that develops security solutions for Windows users. The company started off in 1990 by creating anti-trojan and monitoring solutions for home users. It has currently ventured into personal firewall and Internet security with Outpost Firewall Pro as its flagship product. Agnitum is headquartered in St. Petersburg, Russia.

FiltNT stands for Outpost Firewall Filter Driver for Windows NT

Filtnt.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 filtnt.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for filtnt drivers in need of updating

Filtnt.sys file information

The process known as Virtual Firewall driver belongs to software Agnitum Outpost Firewall Pro or Lavasoft Personal Firewall by Agnitum (

Description: Filtnt.sys is not essential for the Windows OS and causes relatively few problems. Filtnt.sys is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 163,328 bytes (16% of all occurrences), 163,840 bytes and 4 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The service has no detailed description. Filtnt.sys is not a Windows core file. Filtnt.sys is able to manipulate other programs. Therefore the technical security rating is 36% dangerous, however you should also read the user reviews.

Uninstalling this variant: If there are any problems with filtnt.sys, you can also uninstall the associated program (Start > Control Panel > Uninstall a Program > Agnitum Outpost Firewall Pro or Agnitum Outpost Firewall).

Recommended: Identify filtnt.sys related errors

Important: Some malware camouflages itself as filtnt.sys. Therefore, you should check the filtnt.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

Kerneltreiber von Outpost Firewall

Summary: Average user rating of filtnt.sys: based on 1 vote with 1 user comment. One user thinks filtnt.sys is essential for Windows or an installed application.

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Best practices for resolving filtnt issues

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

filtnt.sys [all]