Skip to main content
Barracuda MSP Partner Toolkit

Handling Dual Scan in Managed Workplace

With devices increasingly being moved over to the Windows 10 Kernel (Windows 10, Windows Server 2016 and Windows Server 2019), we have been noticing environments exhibiting patching issues. Devices are not checking in for patch status and are merely not patching overall. We can attribute it to Dual Scan within these operating systems.

Please note: Managed Workplace Supports Windows 10 Pro, Education and Enterprise editions.

To understand Dual Scan, please read the "Demystifying Dual Scan" Microsoft article found here: https://docs.microsoft.com/en-us/archive/blogs/wsus/demystifying-dual-scan

Within Managed Workplace, if you are using Patch Management, you will need to ensure that Dual Scan is disabled. But how?

FIRST OPTION: run the WSUS Client Diagnostic tool located on our Knowledge Base (NOTE: Dual scan is being authored into the tool, but not available yet. Please move to the second option): https://support.barracudamsp.com/Knowledge_Base/Managed_Workplace_(RMM)/Using_the_Managed_Workplace_WsusClientDiagnostic_tool

SECOND OPTION: Check devices for Dual Scan by doing the following.

  1. Open PowerShell as Administrator
  2. Paste in this two-line script

$MUSM = New-Object -ComObject "Microsoft.Update.ServiceManager"
$MUSM.Services | select Name, IsDefaultAUService

Dual Scan.png

Is Windows Server Update Service (WSUS) shows True and other options are false, then Dual Scan is not being utilized? If Windows Update is set as true, Dual Scan is likely enabled.

THE FIX: Start by checking the Domain Configuration Guide (http://download.mw-rmm.barracudamsp.com/PDF/MW12.1.1/Documentation/MW_DC_12_SP1_MR1_MAR20_EN.pdf) to ensure that you are compliant with those settings. If you are, then deploy the Disable Dual Scan for Windows Update script via Managed Workplace.

You can now do the following to acquire the script:

  1. In your Service Center UI go to Update Center
  2. Click on Components
  3. Click on Get More
  4. In the Search Box search for Dual Scan
  5. Select the Disable Dual Scan for Windows Update script and Install
  6. Run the script from the Automation Calendar against targeted Windows 10 Kernel devices

If you are on-premise and wish a copy of the script, you can contact the support desk or you can set up a custom script with the following Registry Key entry to disable the Dual Scan behaviour:

reg add HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate /v DisableDualScan /t REG_DWORD /d 1 /f

  • Was this article helpful?