Infoblox’s global team of threat hunters uncovers a DNS operation with the ability to bypass traditional security measures and control the Great Firewall of China. Read about “Muddling Meerkat” and the many other threat actors discovered by Infoblox Threat Intel here.



Without NXDOMAIN response with No-Exist RR

New Member
Posts: 1
1352     0

DNS queries relating to the our domain work OK if the requested RR exists, but if it doesn't exist, then instead of returning an NXDOMAIN response, the query just times out.


1. Test with Exist RR no problem


2. Test showing that a query for a non-existent RR times out instead of returning NXDOMAIN:


DNS request timed out.

timeout was 2 seconds.

DNS request timed out.

timeout was 2 seconds.

*** Request to Domain timed-out


I've tested this from the Internet as well and the same thing happens.


DNS shouldn't withhold a negative response to a legitimate query. Can someone please advice  why the negative responses are not being returned for this domain/Infoblox Server?

Showing results for 
Search instead for 
Did you mean: 

Recommended for You