I have been recently started working with Sitecore and Sitecore PowerShell Extensions, but have been struggling for a while. On my local clean instance of Sitecore, I have installed the SPE package that will allow me to use PowerShell within Sitecore. When I log in to the Experience platform and choose PowerShell ISE from the menu, I can for example run the following script:

Get-User -id admin

and successfully get the result out of it.

From the official Github repository of SPE I have downloaded the latest release (currently it is 4.7). Then, I have created the following PowerShell script (locally, in Windows PowerShell ISE, not in Sitecore):

param ()
begin {
    [System.String] $SitecoreExtensionsModule = $null

    # Initialize command and script root paths.
    if (-not $PSCommandPath) { $SCRIPT:PSCommandPath = $SCRIPT:MyInvocation.MyCommand.Path }
    if (-not $PSScriptRoot) { $SCRIPT:PSScriptRoot = Split-Path -Path $PSCommandPath -Parent }

    $SCRIPT:PSCommandName = Split-Path -Path $PSCommandPath -Leaf

    # Initialize the Sitecore PowerShell Extensions module.
    if (([System.String]::IsNullOrEmpty($SitecoreExtensionsModule)) -or 
        (-not (Test-Path -Path $SitecoreExtensionsModule -PathType Leaf))) {
        $SitecoreExtensionsModule = Join-Path -Path $PSScriptRoot -ChildPath '.\SPE'

    Import-Module -Name $SitecoreExtensionsModule -DisableNameChecking -Force -Verbose:$false -ErrorAction Stop
process {   
    # Documentation example from SPE.
    $session = New-ScriptSession -Username admin -Password b -ConnectionUri http://sitecoretest:8080 -Timeout ([int]::MaxValue)

    Invoke-RemoteScript -Session $session -ScriptBlock { Get-User -id admin } -Verbose
    Stop-ScriptSession -Session $session

When I run this script, it gives me the following errors:

Set accessor for property "Proxy" is unavailable.
At U:\PowerShell scripts\SPE\Invoke-RemoteScript.ps1:250 char:17
+ ...             $singleConnection.Proxy = New-WebServiceProxy @proxyProps ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], SetValueException
    + FullyQualifiedErrorId : SetWithoutSetterFromScriptProperty

Set accessor for property "Proxy" is unavailable.
At U:\PowerShell scripts\SPE\Stop-ScriptSession.ps1:102 char:13
+             $singleConnection.Proxy = New-WebServiceProxy @proxyProps
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], SetValueException
    + FullyQualifiedErrorId : SetWithoutSetterFromScriptProperty

Invoke-RemoteScript.ps1 and Stop-ScriptSession.ps1 are part of the SPE source code, thus I have no idea why is this error happening. I have been searching over the StackExchange network and also within the issues in the Github repository of the project. Have not found a single thread where someone is asking about such issue, thus I have no idea how to proceed. I have also downloaded previous versions of SPE, like 4.0 and 3.3, but the same error pops up again.

Any help or advise on this is much appreciated. Thanks!

2 Answers 2


I've managed to reproduce the problem, and after removing Timeout or changing in it to - Timeout 100 resolves the problem. I don't know why does not accept [int]::MaxValue, maybe it is doing overflow.

  • Thanks for this! I have tried your solution out, and it is working. No idea why [int]::MaxValue is causing troubles. May 31, 2018 at 14:07

The reason you get this is because the Timeout value is intended to be in seconds. The proxy timeout being set is in milliseconds. I wrote the code to multiply it by 1000; therefore [int]::MaxValue * 1000 will result in an error.

If you divided by 1000 then you could avoid the error.

I submitted an issue to catch for this.

  • Thanks for the explanation, Michael! As @Aleksandar thought, it is indeed an overflow. I was going through the source code, but somehow missed that multiplication. Jun 1, 2018 at 6:25

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