Diagnostic System Host - Windows 10 Service
The Diagnostic System Host is used by the Diagnostic Policy Service to host diagnostics that need to run in a Local System context. If this service is stopped, any diagnostics that depend on it will no longer function.
This service also exists in Windows 11, 8 and Vista.
Startup Type
| Windows 10 version | Home | Pro | Education | Enterprise |
|---|---|---|---|---|
| 1507 | Manual | Manual | Manual | Manual |
| 1511 | Manual | Manual | Manual | Manual |
| 1607 | Manual | Manual | Manual | Manual |
| 1703 | Manual | Manual | Manual | Manual |
| 1709 | Manual | Manual | Manual | Manual |
| 1803 | Manual | Manual | Manual | Manual |
| 1809 | Manual | Manual | Manual | Manual |
| 1903 | Manual | Manual | Manual | Manual |
| 1909 | Manual | Manual | Manual | Manual |
| 2004 | Manual | Manual | Manual | Manual |
| 20H2 | Manual | Manual | Manual | Manual |
| 21H1 | Manual | Manual | Manual | Manual |
| 21H2 | Manual | Manual | Manual | Manual |
| 22H2 | Manual | Manual | Manual | Manual |
Default Properties
| Display name: | Diagnostic System Host |
| Service name: | WdiSystemHost |
| Type: | share |
| Path: | %WinDir%\System32\svchost.exe -k LocalSystemNetworkRestricted -p |
| File: | %WinDir%\system32\wdi.dll |
| Error control: | normal |
| Object: | LocalSystem |
| Privileges: |
|
Default Behavior
The Diagnostic System Host service is running as LocalSystem in a shared process of svchost.exe. Other services might run in the same process. If Diagnostic System Host fails to start, the error is logged. Windows 10 startup proceeds, but a message box is displayed informing you that the WdiSystemHost service has failed to start.
Restore Default Startup Type of Diagnostic System Host
Automated Restore
1. Select your Windows 10 edition and release, and then click on the Download button below.
2. Save the RestoreDiagnosticSystemHostWindows10.bat file to any folder on your hard drive.
3. Right-click the downloaded batch file and select Run as administrator.
4. Restart the computer to save changes.
Note. Make sure that the wdi.dll file exists in the %WinDir%\system32 folder. If this file is missing you can try to restore it from your Windows 10 installation media.