PowerShell Remoting - Invoke-Command not Returning Output

Question

I am running following command remotely from PowerShell in Admin mode. This gets the status of App Pool (in IIS) from remote machine.

$result = Invoke-Command -ComputerName $servername -ScriptBlock {
    param($appPoolName) 
    Get-WebAppPoolState -Name $appPoolName
} -ArgumentList $appPoolName | select value

If I am passing correct values I am getting proper data in $result but if I am passing invalid server name, I am getting below error.

"Connecting to remote server failed with the following error message : WinRM cannot process the request."

The issue is I am not getting anything in $result and even this is not going to Catch block. There is no way to identify if the command run successfully or not.

Please provide any pointers on how to get the command output in $result.

Note: I am the admin on remote machine and WinRM has been enabled.

BenH · Accepted Answer · 2017-04-19 13:22:48Z

1

In order to catch the error, it needs to be terminating. You can force this with -ErrorAction Stop.

try {
    $result = Invoke-Command -ComputerName $servername -ScriptBlock {
        param($appPoolName) 
        Get-WebAppPoolState -Name $appPoolName
    } -ArgumentList $appPoolName -ErrorAction Stop | select value
}
catch {
    $result = [pscustomobject]@{"value"="Not Found"}
}

answered Apr 19, 2017 at 13:22

BenH

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Manu · Accepted Answer · 2017-04-19 14:12:27Z

1

Catch error with try/catch by adding -ErrorAction Stop and display last error with $error[0]

Try{
    $result = Invoke-Command -ComputerName $servername -ErrorAction Stop -ScriptBlock {
        param($appPoolName) 
        Get-WebAppPoolState -Name $appPoolName
    } -ArgumentList $appPoolName | Select-Object value
}
Catch{
    $result = $error[0]
}

answered Apr 19, 2017 at 14:12

Manu

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