Access Denied when creating a scheduled task with powershell and the com schedule.service object

Question

I have a powershell script that creates a scheduled task using a call to RegisterTask via the Schedule.Service com object.

Essentially:

$ts = new-object -com Schedule.Service $ts.Connect() $rootfolder = $ts.GetFolder("\") $taskXml = Get-Content "Task.xml" $rootfolder.RegisterTask("\Maintenance", $taskXml, 6, "LOCAL SERVICE", $null, 5)

This works fine on my local machine (windows 7, and I am a local admin)

When I try this on the machine it will be run on, the RegisterTask call fails with ACCESS_DENIED.

However, if I run a command prompt as administrator, then powershell.exe -file myscript.sps1 it works fine and adds the task.

I have ensured that the user that it is running under has permissions to write to the Tasks folders in %windir% and %windir%/system32

The user is in the Administrators group, which is puzzling, what else do I need to do to give the user the permissions to create scheduled tasks? It seems that just adding them to the local administrators group isn't enough.

EDIT: I have logged onto the server as the user that will be running the script. I can successfully import the xml file into the Task Scheduler UI addin manually.

No, I didn't need to when running it locally. I also changed the script to create the task in the root folder and get the same issue. — Matt
– Matt, Commented Feb 26, 2013 at 1:01

Dennis · Accepted Answer · 2023-02-23 19:09:14Z

Since Powershell 4.0 you can use the ScheduledTask module to create Scheduled tasks without the use of the com-object and easier reading and writing.

Example:

$Action = New-ScheduledTaskAction -Execute "Taskmgr.exe" $Trigger = New-ScheduledTaskTrigger -AtLogon $Principal = New-ScheduledTaskPrincipal "Laptop\Administrator" $Settings = New-ScheduledTaskSettingsSet $Task = New-ScheduledTask ` -Action $Action ` -Principal $Principal ` -Trigger $Trigger ` -Settings $Settings Register-ScheduledTask -TaskName Task1 -InputObject $Task

The first command uses the New-ScheduledTaskAction cmdlet to assign the variable $Action to the executable file tskmgr.exe.

The second command uses the New-ScheduledTaskTrigger cmdlet to assign the variable $Trigger to the value AtLogon.

The third command assigns the variable $Principal to the principal of the scheduled task, Contoso\Administrator.

The fourth command uses the New-ScheduledTaskSettingsSet cmdlet to assign the variable $Settings to a task settings object.

The fifth command creates a new task and assigns the variable $Task to the task definition.

The sixth command (hypothetically) runs at a later time. It registers the new scheduled task and defines it by using the $Task variable.

Dont forget the run the code as Administrator. Source.

Matt · Accepted Answer · 2013-03-06 06:23:41Z

I gave up in the end, couldn't find a way to do this using register tasks, however using schtasks allowed me to import the xml file of the task without the access denied error. I could also use schtasks to import the task to a remote machine.

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