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Mike_Garczynski's avatar
Mike_Garczynski
Copper Contributor
Apr 26, 2026

Upgrade to MS Entra Connect Sync fail

I am trying to upgrade my Server 2022 to the latest verions of MS Entra Connect Sync and it fails. with error 14001.   Researching it shows to Repair the Microsoft Visual C++ retistributables.   I have done that without success.

 

a KB said to uninstall all MS Entra Connect and it uninstalls the remaining components.   However, the repair doesn't resolve the issue.  I tried to uninstall the Microsoft viual C++ 2015-2019 as a note said MS Entra would install it again, but it does not.  I try and install a fresh copy, however, I can't find the site to download.  Where can I find this download version.  Any other clues on fixing the error 14001.  I do have full system backups to restore if needed

microsoft visual C++ 2015-2019 Redistributable (x64) - 14.29.30036

Active Directory
C++ Redistributable
Entra Connect

2 Replies

  • kyazaferr's avatar
    kyazaferr
    MCT
    May 08, 2026

    Error `14001` during Microsoft Entra Connect Sync upgrade is usually related to a corrupted or missing Visual C++ runtime dependency (Side-by-Side configuration issue).

    A few things you can try:

    1. Check the exact SideBySide error in Event Viewer:

    * Open `Event Viewer`

    * Go to:

    `Windows Logs > Application`

    * Look for events with source:

    `SideBySide`

    hose events usually indicate which Visual C++ package or DLL is missing.

    2. Install the latest supported Visual C++ Redistributable manually.

    Microsoft now provides a unified package for 2015-2022:

    * x64:

    [Visual C++ Redistributable 2015-2022 (x64)](https://aka.ms/vs/17/release/vc_redist.x64.exe?utm_source

    * x86:

    [Visual C++ Redistributable 2015-2022 (x86)](https://aka.ms/vs/17/release/vc_redist.x86.exe?utm_source

    Install both x64 and x86 versions even on Server 2022.

    3. Reboot the server after installation.

    4. Run system repair checks:

    DISM /Online /Cleanup-Image /RestoreHealth

    sfc /scannow

    ```

    5. Verify .NET Framework health:

    Get-WindowsFeature *NET*

    ```Aso ensure the latest .NET updates are installed.

    6. Temporarily disable antivirus/EDR during upgrade if applicable.

    7. Before reinstalling Entra Connect Sync:

    * Export current configuration

    * Confirm staging/backup availability

    * Verify SQL LocalDB service is healthy

    You can also completely clean leftover Entra Connect components using:

    Get-WmiObject Win32_Product | Where-Object {

    $_.Name -match "Azure AD|Entra|Microsoft Identity"

    } | Select Name

    ```Then uninstall remaining components manually if necessary.

    Since you already have full backups, worst case you can restore the VM and perform a clean install of the latest Entra Connect Sync version.