vCO-Powershell Plugin issue running a command ( getting members of a local admin group on a server)

Hi,

     Tearing my hair out and looking for a bit of help :-)

I've a powershell script for checking memebers of the Local Adminstrators  group on a server, and it works fine in a powershell window.(running it on the Server that is my VCO powershell host, and under the username/account registered with vCO...)  However when I call it from a vCO workflow it fails. 

To Track it down I isolated the offending code to this section:

I supply $servername as the Server to run the script against.

$group=[ADSI]"WinNT://$servername/Administrators"

$members=@($group.psbase.Invoke("Members"))

$results=$members | foreach{$_.GetType().InvokeMember("Name",'GetProperty',$null,$_,$null)}

and the highlighted Line is the specific code that fails.

the specific error is :

System.Management.Automation.MethodInvocationException: Exception calling "Invoke" with "2" argument(s): "The network path was not found.

I've noted that if I substitute $servername in the 1st line with "." ( ie run against the local server) It works fine. However, if I either use the $servername var, or just embed a specific servername it fails with the above error.

Any help appreciated,

          Thanks in advance,

                    John.

(full error in the vCO log is:

2014-09-11 12:59:16.717] [I] PowerShellInvocationError: Errors found while executing script
System.Management.Automation.MethodInvocationException: Exception calling "Invoke" with "2" argument(s): "The network path was not found.
" ---> System.Runtime.InteropServices.COMException: The network path was not found.

   at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)
   at System.DirectoryServices.DirectoryEntry.Bind()
   at System.DirectoryServices.DirectoryEntry.get_NativeObject()
   at System.DirectoryServices.DirectoryEntry.Invoke(String methodName, Object[] args)
   at System.Management.Automation.DotNetAdapter.AuxiliaryMethodInvoke(Object target, Object[] arguments, MethodInformation methodInformation, Object[] originalArguments)
   --- End of inner exception stack trace ---
   at System.Management.Automation.ExceptionHandlingOps.CheckActionPreference(FunctionContext funcContext, Exception exception)
   at System.Management.Automation.Interpreter.ActionCallInstruction`2.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.LightLambda.RunVoid1[T0](T0 arg0)
   at System.Management.Automation.ScriptBlock.InvokeWithPipeImpl(ScriptBlockClauseToInvoke clauseToInvoke, Boolean createLocalScope, Dictionary`2 functionsToDefine, List`1 variablesToDefine, ErrorHandlingBehavior errorHandlingBehavior, Object dollarUnder, Object input, Object scriptThis, Pipe outputPipe, InvocationInfo invocationInfo, Object[] args)
   at System.Management.Automation.ScriptBlock.<>c__DisplayClassa.<InvokeWithPipe>b__8()
   at System.Management.Automation.Runspaces.RunspaceBase.RunActionIfNoRunningPipelinesWithThreadCheck(Action action)
   at System.Management.Automation.ScriptBlock.InvokeWithPipe(Boolean useLocalScope, Dictionary`2 functionsToDefine, List`1 variablesToDefine, ErrorHandlingBehavior errorHandlingBehavior, Object dollarUnder, Object input, Object scriptThis, Pipe outputPipe, InvocationInfo invocationInfo, Object[] args)
   at System.Management.Automation.ScriptBlock.InvokeUsingCmdlet(Cmdlet contextCmdlet, Boolean useLocalScope, ErrorHandlingBehavior errorHandlingBehavior, Object dollarUnder, Object input, Object scriptThis, Object[] args)
   at Microsoft.PowerShell.Commands.InvokeExpressionCommand.ProcessRecord()
   at System.Management.Automation.CommandProcessor.ProcessRecord()
(Dynamic Script Module name : invokeScript#14)