With advice from Mark I got this working by having Nettime closed and set to run in stand alone mode, then using the following command: "C:\Program Files (x86)\NetTime\Nettime.exe" /updateonce In the log I can see the update command was successful: 20/04/2022 09:45:01 Single Sync Successful. 20/04/2022 09:45:02 NetTime Closing