What is NDProxy?

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

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

NDProxy.sys file information

The process known as NDIS Proxy belongs to software Microsoft Windows Operating System by Microsoft (

Description: The original NDProxy.sys is an important part of Windows and rarely causes problems. The file NDProxy.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 40,576 bytes (36% of all occurrences), 38,016 bytes, 40,960 bytes or 49,664 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. NDProxy.sys is a Windows core system file. The program is not visible. It is a Microsoft signed file. The service has no detailed description. NDProxy.sys appears to be a compressed file. Therefore the technical security rating is 0% dangerous; however you should also read the user reviews.

Recommended: Identify NDProxy.sys related errors

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

it is irresponisble to say that a system file with a .sys extension is probably malware if its in the system 32 folder as most .sys files are residing in the system folder
  not a moron  
Microsoft Windows NDIS proxy that should be located in the C:\Windows\System32\drivers directory.
NDProxy should be a system process, however some DNS changers can add their own NDIS proxy devices redirecting to rogue DNS servers. If you don't trust your Windows system perform an "sfc /scannow" on the command prompt and allow it to restore modified system files.
NDPROXY is a system-provided driver that interfaces NDISWAN and CoNDIS WAN drivers (WAN miniport drivers, call managers, and miniport call managers) to the TAPI services.
  Kelso   (further information)

Summary: Average user rating of NDProxy.sys: based on 3 votes with 4 user comments. 3 users think NDProxy.sys is essential for Windows or an installed application. One user is not sure about it.

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Best practices for resolving NDProxy issues

A clean and tidy computer is the key requirement for avoiding problems with NDProxy. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the NDProxy.sys process on your computer, the following programs have proven to be helpful: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

NDProxy.sys [all]