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NSSM - the Non-Sucking Service Manager

Package test results are passing.

This package was approved as a trusted package on 9/5/2019.

nssm is a service helper which doesn't suck. srvany and other service helper programs suck because they don't handle failure of the application running as a service. If you use such a program you may see a service listed as started when in fact the application has died. nssm monitors the running service and will restart it if it dies. With nssm you know that if a service says it's running, it really is. Alternatively, if your application is well-behaved you can configure nssm to absolve all responsibility for restarting it and let Windows take care of recovery actions.

nssm logs its progress to the system Event Log so you can get some idea of why an application isn't behaving as it should.


  • GUI and CLI interface
  • Configurable action when application exits: restart, ignore, exit, suicide
  • Manage native services
  • Rotate output files from the monitored application
  • Set the monitored application's priority class and CPU affinity
  • UAC aware
  • Unicode support
  • Works under Windows 2000 or later. Specifically, Windows 7, Windows 8 and Windows 10 are supported, x32 and x64 bit versions.

To install NSSM - the Non-Sucking Service Manager, run the following command from the command line or from PowerShell:

C:\> choco install nssm

To upgrade NSSM - the Non-Sucking Service Manager, run the following command from the command line or from PowerShell:

C:\> choco upgrade nssm


  • legal\License.txt Show
    NSSM is public domain.  You may unconditionally use it and/or its source code 
    for any purpose you wish.
  • legal\VERIFICATION.txt Show
    Verification is intended to assist the Chocolatey moderators and community
    in verifying that this package's contents are trustworthy.
    Package is downloaded from and can be verified like this:
    1. Go to
       to download the installer.
    2. You can use one of the following methods to obtain the SHA256 checksum:
       - Use powershell function 'Get-FileHash'
       - Use Chocolatey utility 'checksum.exe'
       checksum32: 99F5045FFFBFFB745D67FE3A065A953C4A3D9C253B868892D9B685B0EE7D07B8
    File 'License.txt' is obtained from:;a=blob;f=README.txt;h=12db7e88a4cd83edb7023b2b92e7d3d5eabf1175;hb=HEAD#l882
  • tools\chocolateyBeforeModify.ps1 Show
    # If some nssm service is up and running, kill it so that exe can be updated
    Get-Process nssm.exe -ea 0 | Stop-Process -Force
  • tools\chocolateyInstall.ps1 Show
    $ErrorActionPreference = 'Stop'
    $toolsDir = Split-Path $MyInvocation.MyCommand.Definition
    if ((Get-OSArchitectureWidth 64) -and $env:chocolateyForceX86 -ne 'true') {
             Write-Host "Installing 64 bit version"; $is64 = $true
    } else { Write-Host "Installing 32 bit version"} 
    $packageArgs = @{
        PackageName  = 'nssm'
        FileFullPath = Get-Item $toolsDir\*.zip
        Destination  = $toolsDir
    Get-ChildItem $toolsDir\* | Where-Object { $_.PSISContainer } | Remove-Item -Recurse -Force #remove older package dirs
    Get-ChocolateyUnzip @packageArgs
    $source = if ($is64) { 'win64' } else { 'win32' }
    Copy-Item $toolsDir\nssm-*\$source\nssm.exe $toolsDir
    Remove-Item -Force $toolsDir\nssm*.zip -ea 0
    Remove-Item -Recurse $toolsDir\nssm-*
  • tools\ Show
    md5: 63175D3830B8A5CFD254353C4F561E5C | sha1: CA2F6782A05AF85FACF9B620E047B01271EDD11D | sha256: 99F5045FFFBFFB745D67FE3A065A953C4A3D9C253B868892D9B685B0EE7D07B8 | sha512: F25FCC7B37D64AA3BB44336182A343250BF7FE7DF1D22795BC742AE1CCE574D9BBBB22AFE2BA4352DF40676E54F8442AE2DC1516C58A7B42C6E5C464804CD342

Virus Scan Results

In cases where actual malware is found, the packages are subject to removal. Software sometimes has false positives. Moderators do not necessarily validate the safety of the underlying software, only that a package retrieves software from the official distribution point and/or validate embedded software against official distribution point (where distribution rights allow redistribution).

Chocolatey Pro provides runtime protection from possible malware.


This package has no dependencies.

Package Maintainer(s)

Software Author(s)

  • Iain Patterson


© Iain Patterson


Release Notes

Version History

Version Downloads Last updated Status
NSSM - the Non-Sucking Service Manager 2.24.101 7771 Monday, December 25, 2017 approved
NSSM - the Non-Sucking Service Manager 2.24.101-g897c7ad 1872 Monday, June 19, 2017 approved
NSSM - the Non-Sucking Service Manager 59546 Monday, June 19, 2017 approved
NSSM - the Non-Sucking Service Manager 40980 Friday, December 23, 2016 approved
NSSM - the Non-Sucking Service Manager 966 Thursday, December 22, 2016 approved
NSSM - the Non-Sucking Service Manager 2.24.0 65388 Sunday, September 14, 2014 approved
NSSM - the Non-Sucking Service Manager 5047 Thursday, December 12, 2013  
NSSM - the Non-Sucking Service Manager 2.16.0 2309 Monday, September 23, 2013  

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