Restart-computer command in start-job scriptblock always returns as state “blocked”.

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  If I run the code below then the created job “test3” always has a state “blocked”. It never executes. It has no additional error message. When I run the command in the start-job scriptblock separately, then it does work (restart-computer -computername $computer -credential $MySecureCreds -force).

  [void][System.Reflection.Assembly]::LoadWithPartialName('presentationframework')
  [xml]$XAML = @"
   
  <Window 
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
          xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         
          Title="CSS Server Reboot" Height="450" Width="800">
      <Grid>
          <ComboBox Name="Server_Combobox" SelectedValuePath="Content" HorizontalAlignment="Left" Margin="240,107,0,0" VerticalAlignment="Top" Width="120">
               <ComboBoxItem Name="Server1">10.15.12.148</ComboBoxItem>          
          </ComboBox>
          <Label Name="Title_Label" Content="CSS – Server Reboot&#xD;&#xA;" HorizontalAlignment="Left" Margin="240,41,0,0" VerticalAlignment="Top" Height="34" Width="284" FontSize="16"/>
          <Button Name="Reboot_Button" Content="Reboot" HorizontalAlignment="Left" Margin="449,107,0,0" VerticalAlignment="Top" Width="75"/>
          <TextBox Name="Reboot_Textbox" Grid.Column="1" HorizontalAlignment="Left" Height="173" Margin="81,180,0,0" TextWrapping="Wrap" VerticalScrollBarVisibility="Auto" Text="" VerticalAlignment="Top" Width="294"/>
      </Grid>
  </Window>
   
  "@
  #Read XAML
  $reader=(New-Object System.Xml.XmlNodeReader $xaml) 
  try{$Form=[Windows.Markup.XamlReader]::Load( $reader )}
  catch{Write-Host "Unable to load Windows.Markup.XamlReader"; exit}
   
  # Store Form Objects In PowerShell
  $xaml.SelectNodes("//*[@Name]") | ForEach-Object {Set-Variable -Name ($_.Name) -Value $Form.FindName($_.Name)}
  
  
  # Secure credential creation
  $Username = "XXX"
  $Password = "XXX"
  $pass = ConvertTo-SecureString -AsPlainText $Password -Force
  $SecureString = $pass
  $MySecureCreds = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $Username,$pass 
  
  # Use the combobox
  $computer
  $jobtest
  $timer = new-object System.Windows.Threading.DispatcherTimer
  
  
  $Server_Combobox.add_SelectionChanged( { 
  
      param($sender, $args)
  
      $Script:computer = $sender.SelectedItem.Content
     
  } )
  
   
  
  #Assign reboot event to button
  $Reboot_Button.Add_Click({
  
  $sb = [scriptblock]::Create("restart-computer -computername $computer -credential $MySecureCreds -force")
  Start-Job -Name "test3" -ScriptBlock $sb
  
  $Script:jobtest = Get-Job -Name "test3"
  
  $Reboot_Textbox.AddText("The restart procedure is starting.`n")
  
  $timer.Interval = [TimeSpan]"0:0:5.00"
  
  
  $timer.add_Tick({
  
  if($jobtest.State -ne "Running"){
  $Reboot_Textbox.AddText("The restart failed, please contact IT Ops !!!`n")
  $Reboot_Textbox.AddText("The error message is:`n")
  $Reboot_Textbox.AddText($jobtest.ChildJobs[0].JobStateInfo.State)
  $Reboot_Textbox.AddText("`n")
  $Reboot_Textbox.AddText($jobtest.ChildJobs[0].JobStateInfo)
  $Reboot_Textbox.AddText("`n")
  $Reboot_Textbox.AddText($jobtest.ChildJobs[0].Error)
  $Script:timer.Stop()
  }elseif($jobtest.State -eq "Completed"){
  $Reboot_Textbox.AddText("The restart procedure completed successfully.")
  $Script:timer.Stop()
  Wait-Job -Name test3 | Remove-Job
  }else{
  $Reboot_Textbox.AddText("The restart procedure is ")
  $Reboot_Textbox.AddText($jobtest.State)
  $Reboot_Textbox.AddText("`n")
  }         
             
  })
  
  $timer.Start()
             
  })
  
  $Form.ShowDialog() | out-null
  
  
     
  
  

  
  

  
  

  Tuesday, August 7, 2018 2:12 PM