Vista - getnameinfo() on IPV6 enable m/c throwing WSANO_DATA

Hi

Ping able to resolve m/c name to IPV6 address.
Reverse have some problem in the m/c. Please throw some light on this.

WSAAddressToString() throws WSATRY_AGAIN and
getnameinfo() throws WSANO_DATA error.

Message Description:
// MessageId: WSATRY_AGAIN
//
// MessageText:
//
// This is usually a temporary error during hostname resolution and
means that the local server did not receive a response from an
authoritative server.
//
#define WSATRY_AGAIN 11002L

// MessageId: WSANO_DATA
//
// MessageText:
//
// The requested name is valid, but no data of the requested type was
found.
//
#define WSANO_DATA 11004L

Thanks,
Mayurnath K.