Microsoft Network Realtime Inspection Service (NisSrv.exe) information

Martin Brinkmann
Aug 29, 2017
Updated • Aug 23, 2017
Antivirus, Windows

If you open the task manager on a device running a recent version of Windows, you may notice the Microsoft Network Realtime Inspection Service (NisSrv.exe) as one of the tasks running on the PC.

It may not be clear immediately if the process is legitimate or not, and what its purpose is. If you run Windows 10, you can expand the name to get Windows Defender Antivirus Network Inspection Service listed underneath the original entry.

Microsoft Network Realtime Inspection Service is a module of Microsoft security software. Which program depends on the version of Windows; on Windows 10 it is the built-in Windows Defender for instance.

The module is a legitimate process, provided that it is located in the right directory on the Windows machine.

microsoft network realtime inspection service

The easiest way to find out about that is to right-click on the item and select open file location from the context menu.

The location that opens should be C:\Program Files\Windows Defender and the file in question NisSrv.exe on Windows 10 machines. On earlier versions of Windows, the location is different as a different program may be used for security. Windows 7 users should find the file listed under c:\Program Files\Microsoft Security Client\Antimalware\NisSrv.exe" for instance.


If you are unsure about the legitimacy of the file, you may want to run additional verification checks. One option that you have is to upload it to to have it scanned for malicious content.

You may also use the information provided by the Windows Services Manager to verify the legitimacy of the process and file.

windows defender antivirus network inspection service

Open the Services Manager afterwards to look up additional information on the service:

  1. Tap on the Windows-key, type services.msc and hit the Enter-key on the keyboard.
  2. Locate Windows Defender Antivirus Network Inspection Service and double-click on the entry to open the properties.

Information listed there include:

  • Service Name: WdNisSvc
  • Display Name: Windows Defender Antivirus Network Inspection Service
  • Path to excutable: "C:\Program Files\Windows Defender\NisSrv.exe"
  • Description: Helps guard against intrusion attempts targeting known and newly discovered vulnerabilities in network protocols

The Network Inspection System is a real-time protection module that monitors network traffic for malicious patterns. You can check out this Microsoft Technet article from 2013 for information on the feature.

Microsoft launched the feature back in October 2012 in Microsoft Security Essentials, and it has been a part of Microsoft's security solutions ever since.

Can you disable the Microsoft Network Realtime Inspection Service?

Microsoft Network Realtime Inspection Service is linked to Windows Defender's real-time protection. You may turn off real-time protection, but it is only temporarily according to the Windows Defender Security Center.

Real-time protection

Locates and stops malware from installing or running on your device. You can turn off this setting for a short time before it turns back on automatically.

So, there is no direct way of disabling the network realtime inspection service using Windows Defender's settings.

Note: The service cannot be disabled.

Generally speaking, it is recommended to keep the service activated. If it causes issues on a machine, you may want to consider switching to another antivirus solution instead as this will disable Windows Defender on the machine.

Microsoft Network Realtime Inspection Service (NisSrv.exe) information
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Microsoft Network Realtime Inspection Service (NisSrv.exe) information
The troubleshooting guide offers information on the Microsoft Network Realtime Inspection Service (NisSrv.exe) on Windows 10 machines.
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  1. Dan Donx said on January 15, 2023 at 10:29 am

    What mental age of reader are you targeting with the first sentence? 10?

    Why not write an article on how to *avoid* upgrading from W10 to W11. Analogous to those like me who avoided upgrading from 7 to 10 for as long as possible.

    If your paymaster Microsoft permits it, of course.

  2. Dexter said on January 15, 2023 at 11:14 am

    5. Rufus
    6. Ventoy

    PS. I hate reading these “SEO optimized” articles.

    1. cdr said on January 15, 2023 at 3:32 pm

      I used Rufus to create an installer for a 6th gen intel i5 that had MBR. It upgraded using Setup. No issues except for Win 11 always prompting me to replace my local account. Still using Win 10 Pro on all my other PCs to avoid the bullying.

  3. sv said on January 15, 2023 at 6:40 pm

    bit pointless to upgrade for the sake of upgrading as you never know when you’ll get locked out because ms might suddenly not provide updates to unsupported systems.

    ps…. time travelling?
    written. Jan 15, 2023
    Updated • Jan 13, 2023

    1. Martin Brinkmann said on January 16, 2023 at 5:49 am

      This happens when you schedule a post in WordPress and update it before setting the publication date.

  4. Anonymous said on January 16, 2023 at 8:24 am

    Anyone willing to downgrade to this awful OS must like inflicting themselves with harm.

  5. basingstoke said on January 16, 2023 at 11:18 am

    I have become convinced now that anybody who has no qualms with using Windows 11/10 must fit into one of the following brackets:

    1) Too young to remember a time before W10 and W11 (doesn’t know better)

    2) Wants to play the latest games on their PC above anything else (or deeply needs some software which already dropped W7 support)

    3) Doesn’t know too much about how computers work, worried that they’d be absolutely lost and in trouble without the “”latest security””

    4) Microsoft apologist that tries to justify that the latest “features” and “changes” are actually a good thing, that improve Windows

    5) Uses their computer to do a bare minimum of like 3 different things, browse web, check emails, etc, so really doesn’t fuss

    Obviously that doesn’t cover everyone, there’s also the category that:

    6) Actually liked W7 more than 10, and held out as long as possible before switching, begrudgingly uses 10 now

    Have I missed any group off this list?

    1. Heinz Strunk said on September 19, 2023 at 3:57 pm

      You have missed in this group just about any professional user that uses business software like CAD programs or ERP Programs which are 99% of all professional users from this list.

      Linux doesn’t help anyone who is not a linux kid and apple is just a fancy facebook machine.

  6. ilev said on August 24, 2023 at 7:34 pm

    Microsoft has removed KB5029351 update

    1. EP said on August 24, 2023 at 9:21 pm

      only from windows update though
      KB5029351 is still available from the ms update catalog site

  7. Anonymous said on August 24, 2023 at 11:05 pm

    1. This update is labaled as PREVIEW if it causes issues to unintelligent people, then they shouldn’t have allowed Preview updates ot install.

    2. I have installed it in a 11 years old computer, and no problems at all.

    3. Making a big drama over a bluescreen for an updated labeled as preview is ridiculous.

    This is probably another BS internet drama where people ran programs and scripts that modified the registry until they broke Windows, just for removing stuff that they weren’t even using just for the sake of it.
    Maybe people should stop playing geeks and actually either use Windows 10 or Windows 11, but don’t try to modify things just for the sake of it.

    Sometimes removing or stopping things (like defender is a perfect example) only need intelligence, not scripts or 3rd party programs that might mess with windows.

  8. john said on August 24, 2023 at 11:17 pm

    Windows 11 was a pointless release, it was just created because some of the Windows team wanted to boost sales with some sort of new and improved Windows 10. Instead, Microsoft cannot support one version well let alone two.

    1. John G. said on August 25, 2023 at 12:08 pm

      Windows 11 is the worst ugly shame by Microsoft ever. They should release with every new W11 version a complete free version of Starallback inside just to make this sh** OS functionally again.

  9. EP said on August 25, 2023 at 3:10 pm

    motherboard maker MSI has recently released a statement regarding the “unsupported processor” blue screen error for their boards using Intel 600/700 series chipsets & to avoid the KB5029351 Win11 update:–UNSUPPORTED-PROCESSOR–Error-Message-of-Windows-11-Update-KB5029351-Preview-142215

  10. EP said on August 29, 2023 at 7:32 pm

    check out the following recent articles:

    Neowin – Microsoft puts little blame on its Windows update after UNSUPPORTED PROCESSOR BSOD bug:

    BleepingComputer – Microsoft blames ‘unsupported processor’ blue screens on OEM vendors:

  11. Leonard Britvolli said on August 30, 2023 at 10:33 pm

    While there may be changes or updates to the Windows 10 Store for Business and Education in the future, it is premature to conclude that it will be discontinued based solely on rumors.

  12. sembrador said on September 5, 2023 at 9:32 pm

    My advice, I left win 15 years ago. Now I’m a happy linux user (linuxmint) but there is Centos, Fedora, Ubuntu depending on your needs.

  13. EP said on September 6, 2023 at 11:55 am

    motherboard maker MSI has recently released new BIOS/firmware updates for their Intel 600 & 700 series motherboards to fix the “UNSUPPORTED_PROCESSOR” problem (Sept. 6):–UNSUPPORTED-PROCESSOR–caused-BSOD-on-MSI-s-Intel-700-and-600-Series-Motherboards-142277

  14. Raphael Benzo said on September 24, 2023 at 9:52 pm

    I try to disable the Diagnostics Tracking Service (Connected Devices Platform User Services) but it wont let me disable it, any help will be greatly appreciated.
    Tank you for your help

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