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Windows Workers in Service Mode

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:

ERROR: QbWorker::killJob(), PostThreadMessage() Invalid thread identifier.

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
  1. Set the following service to Automatic: Interactive Services Detection