Install of AD AD Connect Fails with Sync Service not found

Question

Error from Log
[08:41:09.293] [ 1] [INFO ] ServiceControllerProvider: verifying ADSync is in state (Running)
[08:41:09.293] [ 1] [ERROR] Caught an exception while creating the initial page set on the root page.
Exception Data (Raw): System.InvalidOperationException: Service ADSync was not found on computer '.'. ---> System.ComponentModel.Win32Exception: The specified service does not exist as an installed service
--- End of inner exception stack trace ---
at System.ServiceProcess.ServiceController.GenerateNames()
at System.ServiceProcess.ServiceController.get_ServiceName()
at System.ServiceProcess.ServiceController.GenerateStatus()
at System.ServiceProcess.ServiceController.get_Status()
at Microsoft.Online.Deployment.Framework.Providers.ServiceControllerProvider.IsServiceInState(String serviceName, ServiceControllerStatus desiredStatus)
at Microsoft.Online.Deployment.OneADWizard.Runtime.Stages.DetectInstalledComponents.Execute(String& message, GlobalContext globalWizardContext, Boolean& isPasswordSyncSupported)
at Microsoft.Online.Deployment.OneADWizard.UI.WizardPages.RootPageViewModel.GetInitialPagesCore()
at Microsoft.Online.Deployment.OneADWizard.UI.WizardPages.RootPageViewModel.GetInitialPages()
[08:41:16.735] [ 1] [INFO ] Opened log file at path C:\ProgramData\AADConnect\trace-20220518-084105.log

Answer 1

Open control.exe -> Programs and uninstall all Azure AD / Entra Software.

Reboot and install the newest AzureADSync.msi.

Worked for me.

Answer 2

Hello

Thank you for your question and reaching out. I can understand you are having issues related to AADC sync service installation.

It appears that an uninstall may leave some remnants. Using the corresponding package from my log, I had to trace the AADC Sync Service to the install site. I had to look for the package install location in the registry to find the installer. I removed the leftover pieces and the installation folder once I identified the install location (and the kicker was that there was only a single icon file that didn't uninstall and held up the entire thing being left in the registry, preventing the full removal and subsequent reinstall). I then deleted the registry entry for only this installation. Rebooted, and the AADC Installation completed successfully, followed by regular operation.

Reference : https://social.msdn.microsoft.com/Forums/en-US/137a210f-ddd3-404e-90be-4a9dbcd02ce3/azure-active-directory-connect-service-adsync-was-not-found-on-computer-

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Answer 3

Hello @PAG_1505 , this can be caused by an incomplete or corrupted AD Connect installation. Please try rebooting and:

Repair the installation:

• Run from command line:
  msiexec /fa <AzureADConnect.msi location>

Or:

Uninstalling:

• Run from command line:
  msiexec /uninstall <AzureADConnect.msi location> /quiet /forcerestart
• And re-installl

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