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Fri, Mar 23, 2018 11:05 pm

DNS - Standard Query Response Refused

While filtering on Domain Name System (DNS) queries in the Wireshark packet capture tool with a filter of udp.port==53 on a MacBook Pro laptop running OS X El Capitan (10.11.6), I saw a lot of "Stanard query response refused" replies in the "Info" field for responses from the DNS server. When I expanded the "flags" section of the DNS response for those replies from the DNS server, I saw "Reply code: Refused (5)" for some IP address lookups, though other DNS queries were being answered with an IP address.

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