This should be working with the current packages in 16.04. If you are using MATE, you should be using nm-applet. Both gnome-shell and nm-applet should have been updated to allow the auth-dialog setting to be an absolute path, and it should point to the correct location.
Please make sure you have all updates installed, and please include the version of network-manager-gnome, the version of gnome-shell if it's installed, and the full contents of /etc/NetworkManager/VPN/nm- openconnect-service.name. ** Changed in: network-manager-openconnect (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1661361 Title: network-manager-openconnect VPN connection fails immediately when asking for second authentication factor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager-openconnect/+bug/1661361/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs