#RCODE NXDOMAIN CODE#
When an NXDOMAIN response code is received, the querying resolver will usually stop attempting to resolve that name.
(AAAA records are used to provide name-to-address resolution for IPv6 addresses, as described in RFC1886.) Some DNS servers respond with a “Name Error” response code (NXDOMAIN, RCODE 3) instead of “No Error” (RCODE 0) when queried for a nonexistent AAAA record. Some DNS servers respond with an inappropriate error message if queried for nonexistent AAAA records, which can lead to possible denial of service. Following section is taken directly from Vulnerability Note VU#714121 Overview This means that the cache was not able to resolve the hostname presented in the URL.īefore you read this article, you should read about AAAA records IPv6 addresses in the Domain Name System. Unable to determine IP address from host name The DNS server returned: Name Error: The domain name does not exist. This causes a localized Denial-of-service situation where users behind a specific resolver will get: This is an unusual situation and a misconfiguration on DNS servers that can be exploited using a simple AAAA DNS query.
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