Public bug reported:

Since I have updated to Ubuntu Zesty 17.04 I have had problems with
connecting through VPN. I did not understand at first what was causing
the issue. Now I think I have figured it out and explaining the issue
might help other people with the same problem understanding what is
going on.

I login to my work VPN network using Cisco AnyConnect (available through
package openconnect) and Duo Authentication. Because of Duo
Authentication, there are always two passwords to fill in, one is my
regular password and the other one is a 6 numeric password generated
every few seconds that I need to ascertain from my smartphone. If I
click on the option dialogue box "Save passwords", I think the applet
manager will save both passwords and the next time I try to connect
through VPN it will use both passwords (one of which will be expired)
multiple times until my work account will be locked out. By the time the
dialogue appears allowing me to include the correct passwords, it seems
to be already too late. The login will fail no matter what because now I
have been locked out and I could understand what was going on because
there was no way for me to know that at that point I had been
irrevocably locked out of the ability to VPN.

I do not know if this is a network-manager issue, a network-manager-
applet issue, or an openconnect issue, but this is definitely a
completely new annoying behaviour resulting from the update to Ubuntu
Zesty 17.04.

Also, of notice buy maybe unrelated, if I select in the network-manager-
applet "VPN Connections", the option "Configure VPN..." is greyed out
and cannot be selected anymore. This is also a new behaviour of Ubuntu
Zesty 17.04.

** Affects: network-manager-applet (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1685292

Title:
  Zesty: network-manager-applet VPN 17.04 Cisco AnyConnect fails with
  Duo Authentication

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