WMI Problem on Win7

Anyone understand why the simple Powershell script below works fine under Windows XP but not under Windows 7?

Get-WmiObject -Class win32_logonsession | %{ get-wmiobject -Query "Associators of {Win32_logonSession.LogonID=$($_.LogonId)} where AssocClass = Win32_LoggedOnUser Role=Dependent" }

Under Windows 7 it doesn't list any interactive accounts, only sessions for the local system account, network service etc. However under开发者_开发百科 XP it returns information for all accounts.

Have been looking on MSDN and Google however haven't found an answer as yet.

Seems the problem is that behind the scenes a double hop is occurring and WMI under Windows 7 is trying to find the user account details with an anonymous bind against AD. We only accept authenticated queries so this silently fails.

Going to give WMI a skip and try to pinvoke with LSA functions to get this to work.