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SecurityHealthProxyStub.dll

Updated: Files Available: 35
Verified Metadata AI Analysis x86-64 (64 bit) x86 (32 bit) ARM64

Download and install SecurityHealthProxyStub.dll to fix missing or corrupted DLL errors.

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DLL Overview

Last Updated
Sep 11th, 2025
Filename
SecurityHealthProxyStub.dll
Company
Microsoft Corporation
Product
Microsoft® Windows® Operating System
Description
Windows Defender Security Health Proxy Stub
Architecture
x86-64 (64 bit) x86 (32 bit) ARM64
Metadata Consensus
35/35 Files 100%
Higher percentages indicate stronger agreement across versions. View available versions or browse repository metadata to compare differences between variants.

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About SecurityHealthProxyStub.dll

SecurityHealthProxyStub.dll is a DLL file (Dynamic Link Library) used by Windows programs to share code and resources. It allows multiple applications to use the same functions, improving performance and reducing redundancy.

Overview

What Is SecurityHealthProxyStub.dll?

SecurityHealthProxyStub.dll is a legitimate Windows system component developed by Microsoft Corporation and included with the Microsoft® Windows® Operating System. It is part of the architecture supporting Windows Defender / Windows Security, specifically acting as a proxy stub library used for inter-process communication and COM interface handling.

This DLL helps Windows Security modules communicate safely and consistently across system processes.


What SecurityHealthProxyStub.dll Does

Within Windows Security (formerly Windows Defender), this DLL is used to:

  • Provide proxy/stub COM interfaces for the Security Health Service
  • Facilitate secure communication between Windows Security UI and background services
  • Support system health reporting (antivirus state, firewall state, device security modules)
  • Handle marshaling of requests between protected system components

It is a low-level support file and is not directly interacted with by end-users or applications.


Where SecurityHealthProxyStub.dll Is Located

This DLL is normally stored inside protected Windows directories such as:

C:\Windows\System32\
C:\Windows\WinSxS\

It should not be moved, deleted, or manually replaced. Windows protects it via Windows File Protection (WFP) and servicing mechanisms.


Common Error Messages

Examples of error messages users may encounter include:

"SecurityHealthProxyStub.dll is missing from your computer."
"The program can't start because SecurityHealthProxyStub.dll is missing."
"Entry point not found in SecurityHealthProxyStub.dll"
"SecurityHealthProxyStub.dll failed to load"

These typically occur when system files become corrupted, removed, or mismatched during Windows updates.


How To Fix SecurityHealthProxyStub.dll Errors

Since this is a core Windows file, the fix involves restoring or repairing Windows components.

1. Run System File Checker (SFC)

sfc /scannow

This scans for missing or corrupted system DLLs and attempts automatic repair.

2. Repair Windows Component Store

If SFC reports unrepairable issues, use DISM:

DISM /Online /Cleanup-Image /RestoreHealth

This repairs the underlying component store that Windows relies on for system file restoration.

3. Install pending Windows Updates

Windows Update will reinstall or refresh system components such as SecurityHealthProxyStub.dll.

4. Check antivirus quarantine

Security tools sometimes quarantine system files incorrectly. If the DLL keeps disappearing:

  1. Open antivirus quarantine/history
  2. Look for SecurityHealthProxyStub.dll or related Windows Defender files
  3. Restore if falsely flagged


Summary

  • SecurityHealthProxyStub.dll is an official Windows system file tied to Windows Defender / Windows Security.
  • It acts as a proxy stub DLL for secure communication between Windows Security components.
  • Errors usually stem from corrupted or missing Windows system files.
  • Repairs should be done using SFC, DISM, and Windows Update, rather than manually replacing the DLL.

File information is supported by Human Assisted Artificial Intelligence and should be used as a helpful tool. However, it is important to keep in mind that this information may not be up-to-date or entirely accurate.

Troubleshooting DLL Errors

Most errors involving SecurityHealthProxyStub.dll occur because the DLL is missing, corrupted, or outdated. In many cases, reinstalling the related application or replacing the DLL resolves the issue. The steps below cover the most common and reliable ways to fix these errors.

Windows DLL Error Examples

This application has failed to start because SecurityHealthProxyStub.dll was not found. Re-installing the application may fix this problem.
SecurityHealthProxyStub.dll Not Found.

Fixes and Solutions

The first step in resolving DLL errors is to completely uninstall the affected software and reinstall its latest version. We know this does not always solve the problem, which is why DLLme exists. If reinstalling the application does not help, or if you are unsure which app is causing the error, follow the steps below. These are the most common solutions for fixing SecurityHealthProxyStub.dll errors.

  • Repair Windows: Make sure Windows is fully updated, then open Windows Terminal or PowerShell as an administrator (search for “PowerShell” in the Start menu, right-click it, and choose “Run as administrator”). This allows you to repair the Windows component store and run the System File Checker (SFC).

    Repair the Windows component store so SFC can pull clean files:

    DISM /Online /Cleanup-Image /RestoreHealth

    Scan all protected system files and automatically repair problems:

    sfc /scannow
  • Uninstall & Reinstall: On this DLL page, check the Company/Product section to identify the related app, then fully uninstall it. If you plan to continue using it, reinstall the latest version. Be sure to save or back up any important data before uninstalling. Windows or antivirus software may sometimes quarantine DLL files, especially if the DLL is unfamiliar or appears suspicious. Check your antivirus quarantine or logs to determine if this is the cause of your issue.
  • Download the DLL: Download the latest 32-bit or 64-bit version of the DLL directly from our repository using the download button above. Most users will need the 64-bit version, but if you are unsure, or if a 64-bit version is not available, you can install both the 32-bit and 64-bit DLLs. DLLme verifies DLLs that come from our admins, partners, and trusted affiliates. User-uploaded files may be verified later if a trusted source is confirmed.
  • Register the DLL: Most DLL files do not need registration, but some DLLs are COM components and must be registered to work correctly. If registration is required, open Windows Terminal or PowerShell as an administrator.

    Register the DLL (you can also drag the DLL file into the window to automatically fill in its full path):

    regsvr32 "C:\path\to\SecurityHealthProxyStub.dll"

    If you are registering a 32-bit DLL on 64-bit Windows, use the 32-bit RegSvr32:

    C:\Windows\SysWOW64\regsvr32 "C:\path\to\SecurityHealthProxyStub.dll"

    Or open Windows Terminal/PowerShell in the DLL’s folder and run:

    regsvr32 SecurityHealthProxyStub.dll

How to Install SecurityHealthProxyStub.dll

To install SecurityHealthProxyStub.dll, place the DLL file in the appropriate Windows system folder or in the same folder as the application’s .exe file. If you are not sure which version (32-bit or 64-bit) to use, you can safely install both.

On 64-bit versions of Windows, place 64-bit DLL files in:

C:\Windows\System32\SecurityHealthProxyStub.dll

Place 32-bit DLL files in:

C:\Windows\SysWOW64\SecurityHealthProxyStub.dll

Or place the DLL file next to the application’s .exe:

C:\path\to\exe\SecurityHealthProxyStub.dll

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