dhclient can't obtain IPv6 addr

[Mikhail]

gnome-control-center reports Ethernet Connection Failure with TLS Authentication

1) Ubuntu 19.10
2) 1:3.34.1-1ubuntu2
3) Show Connected for Wired Connection
4) Show Disconnected for Wired Connection

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: gnome-control-center 1:3.34.1-1ubuntu2
ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
Uname: Linux 5.3.0-19-generic x86_64
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 28 17:06:43 2019
InstallationDate: Installed on 2019-08-01 (88 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to eoan on 2019-10-28 (0 days ago)

[Sebastien Bacher (seb128)]

Thank you for your bug report. What do you mean 'with TLS Authentification'? Could you describe with more details your setup/how to trigger the bug and where/how the failure is displayed? (could you include a screenshot?)
Connection a 19.10 laptop to a wired eth with a standard dhcp seems to work and display the correct status here

[Mikhail (xmrmipo)]

Screenshot with my setup is attached.

[Mikhail (xmrmipo)]

Screenshot with wireshark log is attached

[Sebastien Bacher (seb128)]

Thanks, could you also show a screenshot of the failure UI report?

[Mikhail (xmrmipo)]

1) Status switched to "Connecting" for 20-30 secs
2) UI asked for private key password
3) Status switched to "Disconnected"

[Sebastien Bacher (seb128)]

Sorry but I still don't understand what UI you are talking about, can you make a screenshot?

[Mikhail (xmrmipo)]

Sorry for wrong package name changed to network-manager

[Sebastien Bacher (seb128)]

unsure where the communication is failing, but could you provide a screenshot showing the issue? or if not at least state that you can't/don't want and try to explain better what UI is having the incorrect status?

[Mikhail (xmrmipo)]

Can't explain better, but I found root cause.

So, full steps to reproduce:

1) sudo service NetworkManager stop
2) sudo wpa_supplicant -c /etc/wpa_supplicant/wired.conf -i eth1 -D wired
3) sudo dhclient eth1
4) see in output "ls: cannot access '/run/systemd/resolved.conf.d/isc-dhcp-v6-***.conf': No such file or directory"
5) check ifconfig that only IPv4 address was received

Work-around: Disable IPv6 for Ethernet

[Sebastien Bacher (seb128)]

closing since the description isn't clear, feel free to reopen if the requested screenshot showing the problem is added though