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ITsVISTA KB-Link: KB2299432

Winsock name resolution APIs use separate cache entries for AF_UNSPEC and AF_INET/AF_INET6 queries

After an application calls getaddrinfo with AF_UNSPEC on hints, if you call getaddrinfo again with AF_INET/AF_INET6, the function doesn’t use the DNS cache and sends a DNS query to the wire. DnsQuery with option DNS_QUERY_NO_WIRE_QUERY may fail with DNS_ERROR_RECORD_DOES_NOT_EXIST even after an application calls getaddrinfo.

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2299432.

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