Unable to run powershell script in background using task scheduler?

PowerShell Help
1

Hi,

I am unable to run a powershell script in the background using task scheduler. No matter what account I use it’s not working. The command to start the script works if I execute it directly in powershell.

The command to run in powershell is this one:

start-process powershell -WindowStyle Hidden -ArgumentList "\\my_server\Wake_On_Lan\Wake_on_lan_web_server.ps1"
The command in task scheduler:
The script is small web server in powershell:
# Web server

version 1.0


Web Server Powershell : https://hinchley.net/articles/create-a-web-server-using-powershell/


$url = ‘http://192.168.0.1:66/’

$template = @’

<!DOCTYPE HTML>

<html>

<head>

<title>WOL</title>

<style type=“text/css”>

html, body, #container {height:95%}

body {font-family:verdana;line-height:1.5}

form, #container, p {align-items:center;display:flex;flex-direction:column;justify-content:center}

input {border:1px solid #999;border-radius:4px;margin-bottom:10px;padding:4px}

input[type=submit] {padding:6px 10px}

label, p {font-size:10px;padding-bottom:2px;text-transform:uppercase}

</style>

</head>

<body>

<div id=“container”>

<div id=“content”>

{page}


</body>

</html>

‘@

$form = @’

<form method=“post”>

<label for=“pc_Name”>Nom DTXXXX?</label>

<input type=“text” name=“pc_Name” value=“” required />

<input type=“submit” name=“submit” value=“Submit” />

</form>

‘@

$hello = @’

<p>Wol transmit a {name}.<br/><a href=“/”>Ouvrir un autre PC?</p>

'@


request actions.


$routes = @{

‘GET /’  = { return (render $template $form) }

‘POST /’ = {

# get post data.

$data = extract $request

# get the submitted name.

$name = $data.item(‘pc_Name’)

# render the name.

$page = render $hello @{name = $name}


# embed the snippet into the template.



render $template $page

start-process powershell -WindowStyle Hidden -ArgumentList “\my_server\Wake_On_Lan\Wake_on_Lan_Zenwork.ps1  -type pc -zenwork_group $name”


}

}


embed content into the default template.


function render($template, $content) {


shorthand for rendering the template.


if ($content -is [string]) { $content = @{page = $content} }

foreach ($key in $content.keys) {

$template = $template -replace “{$key}”, $content[$key]

}


return $template

}


get post data from the input stream.


function extract($request) {

$length = $request.contentlength64

$buffer = new-object “byte” $length

[void]$request.inputstream.read($buffer, 0, $length)

$body = [system.text.encoding]::ascii.getstring($buffer)

$data = @{}

$body.split(‘&’) | %{

$part = $_.split(‘=’)

$data.add($part[0], $part[1])

}

return $data

}

$listener = new-object system.net.httplistener

$listener.prefixes.add($url)

$listener.start()

while ($listener.islistening) {

$context = $listener.getcontext()

$request = $context.request

$response = $context.response

$pattern = “{0} {1}” -f $request.httpmethod, $request.url.localpath

$route = $routes.get_item($pattern)

if ($route -eq $null) {

$response.statuscode = 404

} else {

$content = & $route

$buffer = [system.text.encoding]::utf8.getbytes($content)

$response.contentlength64 = $buffer.length

$response.outputstream.write($buffer, 0, $buffer.length)

}

$response.close()

}

Am I missing something? I need the script to run while I am not logged in.

2

Try moving the script to the local server. If it works, then you are most likely dealing with a double-hop issue by executing with credentials on the local server and then trying to execute a script via a UNC path which require authentication.

3

I just did and it’s working.

I have replaced “\my_server\Wake_On_Lan\Wake_on_lan_web_server.ps1” with “D:\Wake_On_Lan\Wake_on_lan_web_server.ps1”

Thanks a lot!