You have been subscribed to a public bug:

Suppose that:

1. you have a "search" line in your /etc/resolv.conf file;
2. it has two domains in it; and
3. the first of the two domains does DNSSEC, including returning NSEC records 
for nonexisting hosts.

In this situation, when you try to look up a host name in the second
domain without specifying the domain part of the host name, the libc
resolver will stop after it gets back the NSEC record and report that
the host name doesn't exist, rather than moving on to the second domain
in the search list and searching for the host in that domain.

See also https://bugs.launchpad.net/ubuntu/+source/bind9/+bug/1717014 .

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: libc6 2.24-9ubuntu2.2
ProcVersionSignature: Ubuntu 4.10.0-33.37-generic 4.10.17
Uname: Linux 4.10.0-33-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
CurrentDesktop: Unity:Unity7
Date: Wed Sep 13 16:00:45 2017
Dependencies:
 gcc-6-base 6.3.0-12ubuntu2
 libc6 2.24-9ubuntu2.2
 libgcc1 1:6.3.0-12ubuntu2
InstallationDate: Installed on 2016-08-09 (400 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: glibc
UpgradeStatus: Upgraded to zesty on 2017-04-19 (147 days ago)

** Affects: systemd (Ubuntu)
     Importance: High
         Status: New


** Tags: amd64 apport-bug zesty
-- 
libc resolver stops searching domain search list after getting back NSEC record
https://bugs.launchpad.net/bugs/1717015
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