Network Driver Interface Specification: An application programming interface (API) for network interface cards (NICs).

On a computer that is running Windows Vista, you intermittently lose access to network resources if more than one Network Device Interface Specification (NDIS) filter driver is installed.

When you create an application to establish a virtual private network (VPN) tunnel in Windows Vista, the value that is returned by an API function is not what you expect. The remote access service incorrectly registers the VPN tunnel as an “IF_TYPE_PPP” Network Driver Interface Specification (NDIS) network interface type.

You create a device driver that is based on the Microsoft PassThru Network Driver Interface Specification (NDIS) Intermediate Driver from the Windows Driver Kit (WDK). Then, you install this device driver on a computer that is running Windows Vista. When you restart the computer, Windows Vista incorrectly detects the miniport edge of the PassThru driver as a wireless local area network (WLAN) adapter.

Therefore, if you access the WLAN adapter manually, you may be unable to connect to a wireless access point.

After you upgrade a Microsoft Windows XP-based computer to Windows Vista, or you upgrade a pre-release version of Windows Vista to the release version of Windows Vista, third-party network-related programs may no longer function.

You experience this issue with programs such as virtual private network (VPN) programs or load balancing and failover (LBFO) programs.