The Win32_NetworkAdapterConfiguration class is unable to retrieve information about PPPoE (Point-to-point protocol over Ethernet) and VPN (Virtual Private Network).
On Windows Vista and later, the Win32_NetworkAdapterConfiguration class is unable to retrieve information about a PPPoE connection and VPN connection.
If a program is designed to get the information about the dial-up connection or a virtual private network by using the Win32_NetworkAdapterConfiguration class on Windows XP, it may not work on Windows Vista and later.
For more information about the Win32_NetworkAdapterConfiguration class, see the following MSDN documentation:
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2549091.