It goes further.

If the desktop/laptop only has IPv6 (no IPv4 connectivity) nm-openvpn
tries to connect to the IPv4 host and fails, disregardless, that an AAAA
record is available and reachable.

Essentially, nm-openvpn does not allow for tcp6-client or udp6-client to
be configured or to be autoselected. If IPv6 connectivity is available
and an AAAA record for the OpenVPN Server is in place, tcp6-client or
udp6-client should be tried/initiated first with fallback to tcp-client
/udp-client.

If no IPv6 connectivity is available, then trying tcp6-client/udp6-client is 
not needed.
If no IPv4 connectivity is available, then trying tcp-client/udp-client is not 
needed.

It has either to be autoguessed (like the Android OpenVPN app does) or
be configurable. As it is now, nm-openvpn does neither.

ii  network-manager                            1.2.2-0ubuntu0.16.04.3           
             i386         network management framework (daemon and userspace 
tools)
ii  network-manager-gnome                      1.2.0-0ubuntu0.16.04.4           
             i386         network management framework (GNOME frontend)
ii  network-manager-openvpn                    1.1.93-1ubuntu1                  
             i386         network management framework (OpenVPN plugin core)
ii  network-manager-openvpn-gnome              1.1.93-1ubuntu1                  
             i386         network management framework (OpenVPN plugin GNOME 
GUI)

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.1 LTS"

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager-openvpn in Ubuntu.
https://bugs.launchpad.net/bugs/1508064

Title:
  nm-openvpn IPV6 problem with AAAA only record

Status in network-manager-openvpn package in Ubuntu:
  Confirmed

Bug description:
  I cannot connect to an OpenVPN server with AAAA only record : it
  cannot resolve host address

  
  journalctl -f :

  oct. 20 16:03:29 nfl-pad nm-openvpn[29304]: RESOLVE: Cannot resolve
  host address: xxx.xxx.xxx: Name or service not known

  Versions :

  ii  network-manager                                 0.9.10.0-4ubuntu15.3      
   amd64                        network management framework (daemon and 
userspace tools)
  ii  network-manager-gnome                           0.9.10.1-0ubuntu4.1       
   amd64                        network management framework (GNOME frontend)
  ii  network-manager-openvpn                         0.9.10.0-1ubuntu1         
   amd64                        network management framework (OpenVPN plugin 
core)
  ii  network-manager-openvpn-gnome                   0.9.10.0-1ubuntu1         
   amd64                        network management framework (OpenVPN plugin 
GNOME GUI)

  Of course it works perfectly from command line ... without NM...

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/network-manager-openvpn/+bug/1508064/+subscriptions

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