If your workers are:

    • Windows-based
    • configured to be in service mode (either "proxy" or "user" mode, and NOT "Desktop User mode")
    • use Active Directory's GPO (Group Policy Objects)

    You may see one or more of the following symptoms:

    • You cannot kill, block, or otherwise manipulate a running job instance
    • You cannot lock a worker and purge jobs that are currently running on it
    • Aggressive preemption not working as expected

    If you so see any of these symptoms, check your workerlog to see if you can find an ERROR message similar to:

     

    Carrying out the following steps as the Administrator on your Windows workers could solve your issue.

    1. Change Registry Key Here: 

      HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows 
      DWORK = NoInteractiveServices 
      Value data: 0

    2. Set the following service to Automatic: ‘Interactive Services Detection’

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