Warning Another instance of Singleton Task is running during the PMImport process
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Warning Another instance of Singleton Task is running during the PMImport process


Article ID: 177054


Updated On:


Patch Management Solution for Windows


The following warnings are seen in the Notification server logs during the PMImport process.

Source: Altiris.PatchManagementCore.Tasks.Server.SerializingBaseSingletonServerTask`2.OnExecute
Description: Another instance of Singleton Task is running

Source: PMC:SerializingBaseSingletonServerTask`2.OnExecute
Description: OnExecute()- Another instance of Import Patch Data for Windows task is running, aborting.


This may also be seen with other tasks like: Revise Software Update, Microsoft Patch Management Import, Check Software Update Package Integrity etc.

Source: Altiris.TaskManagement.ServerTasks.ServerTaskExecutionInstance.Sleep
Description: Task instance Re-Run Adobe Patch Management Import1 (1/1/0001 12:00:00 AM) is being put to sleep until 11/9/2009 1:41:32 PM. Instance GUID: 483d3573-5fd5-407c-9fbd-13dc31baaeb7

Source: Altiris.TaskManagement.ClientTask.*
Description: Resuming task instance Adobe Patch Management Import (1/1/0001 12:00:00 AM)(483d3573-5fd5-407c-9fbd-13dc31baaeb7)






Patch Management Solution


Currently multiple PMImports cannot be running at the same time.


Work through the following steps on the Notification Server > Console > Manage > Jobs and Tasks > System Jobs and Tasks > Software > Patch Management > Microsoft Patch Management Import  

  1. Stop all running instances of Import Patch Data
    • Highlight the attempts; right-click / Stop
    • Ensure clean up processes, like Revise Software Update Task, are also stopped: TECH45458
      • Contact support if unable to access the hidden Revise Software Update Task through the URL provided on this KM
      • Note: this hidden URL is not supported; however, this URL is a means to stopping any queued instances of this task
  2. Run the corresponding commands to reconfigure the database to the current version of Patch Management installed.
  3. Run the PMImport manually or allow to run on schedule
    • Disable the 'Incremental download' setting / save changes.
    • May need to adjust the schedule to allow for the full process of .cab download and clean up to complete.