Azure Active Directory Connect Unable to connect to the Synchronization Service

Error message when trying to run Azure Active Directory Connect = Unable to connect to the Synchronization Service. Some possible reasons are: 1) The service is not started. 2) Your account is not a member of a required security group. See the Synchronization documentation for details.

Unable to connect to the synchronization service

Check Service

First check the service is running. Use services.msc or PowerShell.

If it’s stopped, start it.

Run the Synchronization Service as administrator

From Taskbar

Right click Synchronization Service icon

Right click Synchronization Service

Select Run as administrator

run as administrator from taskbar

From Apps menu

Right Click on Synchronization Service

Select Run as administrator

runas administrator from apps menu