DnsValidateServerStatus function (windns.h)

The DnsValidateServerStatus function validates an IP address as a suitable DNS server.

Syntax

DNS_STATUS DnsValidateServerStatus(
  [in]  PSOCKADDR server,
  [in]  PCWSTR    queryName,
  [out] PDWORD    serverStatus
);

[in] server

A pointer to a SOCKADDR that contains the DNS server IPv4 or IPv6 address to be examined.

[in] queryName

A pointer to a Unicode string that represents the fully qualified domain name (FQDN) of the owner of the record set that is queried.

[out] serverStatus

A pointer to a DWORD that represents the query validation status.

Value	Meaning
ERROR_SUCCESS	No errors. The call was successful.
DNS_VALSVR_ERROR_INVALID_ADDR	server IP address was invalid.
DNS_VALSVR_ERROR_INVALID_NAME	queryName FQDN was invalid.
DNS_VALSVR_ERROR_UNREACHABLE	DNS server was unreachable.
DNS_VALSVR_ERROR_NO_RESPONSE	Timeout waiting for the DNS server response.
DNS_VALSVR_ERROR_NO_AUTH	DNS server was not authoritative or queryName was not found.
DNS_VALSVR_ERROR_REFUSED	DNS server refused the query.
DNS_VALSVR_ERROR_NO_TCP	The TCP query did not return ERROR_SUCCESS after the validation system had already completed a successful query to the DNS server using UDP.
DNS_VALSVR_ERROR_UNKNOWN	An unknown error occurred.

The DnsValidateServerStatus function has the following possible return values:

Requirement	Value
Minimum supported client	Windows 7 [desktop apps only]
Minimum supported server	Windows Server 2008 R2 [desktop apps only]
Target Platform	Windows
Header	windns.h
Library	Dnsapi.lib
DLL	Dnsapi.dll