On a Windows Vista-based computer
or on a Windows Server 2008-based computer, the
Microsoft ISATAP adapter appears with a yellow exclamation mark (!) next to it
in Device Manager. Additionally, when you open the properties dialog box for
the device, you receive an error message that resembles the following:
Windows cannot load driver (Code 31)
You can safely ignore this error message. This error
message does not indicate a problem with the adapter. The adapter will continue
to work correctly.
has confirmed that this is a problem in the Microsoft products that are listed
in the "Applies to" section.
The Microsoft ISATAP device Inter Site Automatic Tunneling
Address Protocol is used to help enterprises transition to an IPv6
infrastructure. The ISATAP adapter encapsulates IPv6 packets by using an IPv4
header. This functionality enables the client to transport IPv6 traffic over an
IPv4 infrastructure. This approach lets organizations slowly migrate to an IPv6
infrastructure without having to spend excessive time and financial resources
to convert to the new infrastructure.