Error - Service ADSync was not found on computer '.'

Error when installing Entra Connect Sync: Service ADSync was not found on computer ‘.’ #

Written 07/10/25
PROMPT: You are attempting to (re)install ADSync onto a Windows server and you run into the error message: Service ADSync was not found on computer ‘.’

Resources: #

Arhived MSDN TechNet post

Steps: #

  1. On the offending server, open Registry Editor.
  2. Navigate to HKLM\SOFTWARE\Classes\Installer\Products
  3. Start from the first registry key at the top and use the arrow keys to go through each key. Inside each key there will be a string value named ProductName, with a value of the program name. Once you find the key containing ADSync, you can delete the entire key.
  4. You should now be able to install ADSync without any trouble.
    • Note that this is supposedly indicative of other issues with the OS.