windows server 2008 - Remote PowerShell script doesn't apply Hyper-V Snapshot -

i'm attempting remotely apply hyper-v snapshot through powershell. i'm following ben armstrong's guide this.

i'm in server 2008 r2, way.

in nutshell:

connecting remote server:

$password = convertto-securestring "password" -asplaintext -force $cred = new-object system.management.automation.pscredential ("domain\user", $password) enter-pssession -computer computername -credential $cred 

this works fine. i've tested remote connection creating folder on machine.

applying snapshot:

$hypervserver = read-host "specify hyper-v server use (enter '.' local computer)"  # prompt virtual machine use $vmname = read-host "specify name of virtual machine"  # prompt name of snapshot apply $snapshotname = read-host "specify name of snapshot apply"  # management service $vmms = gwmi -namespace root\virtualization msvm_virtualsystemmanagementservice -computername $hypervserver  # virtual machine object $vm = gwmi msvm_computersystem -filter "elementname='$vmname'" -namespace "root\virtualization" -computername $hypervserver  # find snapshot want apply $snapshot = gwmi -namespace root\virtualization -query "associators of {$vm} assocclass=msvm_elementsettingdata resultclass=msvm_virtualsystemsettingdata" | {$_.elementname -eq $snapshotname} | select -first 1  # apply snapshot $vmms.applyvirtualsystemsnapshot($vm, $snapshot) 

i execute these one-by-one, it's finding vm , snapshot fine, when execute final command, snapshot not applied. doesn't fail either, no error message.

i following, however, after executing final command:

__genus          : 2 __class          : __parameters __superclass     :  __dynasty        : __parameters __relpath        :  __property_count : 1 __derivation     : {} __server         :  __namespace      :  __path           :  returnvalue      : 32775 

this return value indicates invalid state operation (32775) according this msdn page. mean? how fix apply snapshot?

the vm in running state, tried again vm shut down , snapshot applied properly.

how can force snapshot apply vm in running state?

the article states that:

one thing aware of operation fail if virtual machine running when try apply snapshot – virtual machine needs turned off or put saved state first.

applyvirtualsystemsnapshot doesn't work remotely running vm's