[Bug 1727237] Re: systemd-resolved is not finding a domain

[mistermatt2u]

What is the release / package version in use of systemd? 
234-2ubuntu12.1

How is the networking configured: netplan, ifupdown, networkd, networkmanager? 
networkmanager (I presume, ubuntu 17.10 default)

What is the contents of /etc/resolv.conf?
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 127.0.0.53

Where does the symlink of /etc/resolv.conf point to? (if it is a symlink)
../run/systemd/resolve/stub-resolv.conf

What is the contents of /etc/systemd/resolved.conf ?
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See resolved.conf(5) for details

[Resolve]
#DNS=
#FallbackDNS=
#Domains=
#LLMNR=yes
#MulticastDNS=yes
#DNSSEC=no
#Cache=yes
#DNSStubListener=udp

Is libnss-resolve package installed?
No.

What is the output of $ systemd-resolve --status ?
(if --status option is available)
Global
          DNSSEC NTA: 10.in-addr.arpa
                      16.172.in-addr.arpa
                      168.192.in-addr.arpa
                      17.172.in-addr.arpa
                      18.172.in-addr.arpa
                      19.172.in-addr.arpa
                      20.172.in-addr.arpa
                      21.172.in-addr.arpa
                      22.172.in-addr.arpa
                      23.172.in-addr.arpa
                      24.172.in-addr.arpa
                      25.172.in-addr.arpa
                      26.172.in-addr.arpa
                      27.172.in-addr.arpa
                      28.172.in-addr.arpa
                      29.172.in-addr.arpa
                      30.172.in-addr.arpa
                      31.172.in-addr.arpa
                      corp
                      d.f.ip6.arpa
                      home
                      internal
                      intranet
                      lan
                      local
                      private
                      test

Link 2 (wlp2s0b1)
      Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 172.16.50.1

Is this a captive portal hostage situation with Ubuntu failing to get to the captive portal to enable internet?
Yes.

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https://bugs.launchpad.net/bugs/1727237

Title:
  systemd-resolved is not finding a domain

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  I have an odd network situation that I have so far managed to narrow
  down to the inability to resolve a domain via systemd-resolved which
  is resolvable with nslookup. If I use nslookup against the two
  nameservers on this network I get answers for the domain, but ping
  says it is unable to resolve the same domain (as do browsers and
  crucially the captive portal mechanism).

  Here are details:

  NSLOOKUP:

  ~$ nslookup securelogin.arubanetworks.com 208.67.220.220
  Server:		208.67.220.220
  Address:	208.67.220.220#53

  Non-authoritative answer:
  Name:	securelogin.arubanetworks.com
  Address: 172.22.240.242

  ~$ nslookup securelogin.arubanetworks.com 208.67.222.222
  Server:		208.67.222.222
  Address:	208.67.222.222#53

  Non-authoritative answer:
  Name:	securelogin.arubanetworks.com
  Address: 172.22.240.242

  
  PING:

  ~$ ping securelogin.arubanetworks.com
  ping: securelogin.arubanetworks.com: Name or service not known
  mark at mark-X1Y2:~$ 

  
  DIG:

  ~$ dig @208.67.222.222 securelogin.arubanetworks.com

  ; <<>> DiG 9.10.3-P4-Ubuntu <<>> @208.67.222.222 securelogin.arubanetworks.com
  ; (1 server found)
  ;; global options: +cmd
  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 9416
  ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

  ;; OPT PSEUDOSECTION:
  ; EDNS: version: 0, flags:; udp: 4096
  ;; QUESTION SECTION:
  ;securelogin.arubanetworks.com.	IN	A

  ;; AUTHORITY SECTION:
  arubanetworks.com.	1991	IN	SOA	dns5.arubanetworks.com. hostmaster.arubanetworks.com. 1323935888 3600 200 1209600 86400

  ;; Query time: 34 msec
  ;; SERVER: 208.67.222.222#53(208.67.222.222)
  ;; WHEN: Wed Oct 25 10:31:10 CEST 2017
  ;; MSG SIZE  rcvd: 144

  
  MORE DIG:

  ~$ dig securelogin.arubanetworks.com

  ; <<>> DiG 9.10.3-P4-Ubuntu <<>> securelogin.arubanetworks.com
  ;; global options: +cmd
  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 3924
  ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

  ;; OPT PSEUDOSECTION:
  ; EDNS: version: 0, flags:; udp: 65494
  ;; QUESTION SECTION:
  ;securelogin.arubanetworks.com.	IN	A

  ;; Query time: 0 msec
  ;; SERVER: 127.0.0.53#53(127.0.0.53)
  ;; WHEN: Wed Oct 25 10:34:01 CEST 2017
  ;; MSG SIZE  rcvd: 58

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