What is protect.dll?

Protect.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. You can fix your protect.dll problem by downloading the correct protect.dll file. The following information can help you determine if protect.dll is a Windows system file or if it belongs to an application that you can trust.

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Protect.dll file information

The process known as lib or NoxzOES9 Application or FortKnox Personal Firewall (version 2008) or Application belongs to software lib or NETGATE FortKnox Personal Firewall (version 2008) or Microsoft or Microsoft NoxzOES9 Application by Microsoft ( or NETGATE Technologies s.r.o (

Description: Protect.dll is not essential for the Windows OS and causes relatively few problems. Protect.dll is located in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 24,064 bytes (42% of all occurrences), 22,016 bytes, 20,992 bytes or 23,552 bytes. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. The program starts upon Windows startup (see Registry key: Run, DEFAULT\Run). The file is not a Windows core file. It is a file with no information about its developer. It can change the behavior of other programs or manipulate other programs. The program is not visible. The service has no detailed description. Protect.dll is able to record keyboard and mouse inputs and manipulate other programs. Therefore the technical security rating is 60% dangerous.

Recommended: Identify protect.dll related errors

If protect.dll is located in a subfolder of "C:\Program Files", the security rating is 37% dangerous. The file size is 15,264 bytes (20% of all occurrences), 313,936 bytes, 24,064 bytes, 341,856 bytes or 318,032 bytes. The protect.dll file is not a Windows core file. The program has no visible window. There is no detailed description of this service. It can change the behavior of other programs or manipulate other programs. The file is digitally signed. Protect.dll is able to record keyboard and mouse inputs, manipulate other programs and monitor applications.

Uninstalling this variant: The software publisher Netgate provides update information ( You could uninstall the program using the Control Panel ⇒ Uninstall a ProgramNETGATE Internet Security or FortKnox Personal Firewall 2008.

Important: Some malware also uses the file name protect.dll, for example Trojan:Win32/Opachki.A or TrojanDropper:Win32/Opachki.A (detected by Microsoft), and Trojan Horse or Trojan.Fakeavalert (detected by Symantec). Therefore, you should check the protect.dll 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.


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Best practices for resolving protect issues

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

protect.dll [all]