andree@andree:~$ journalctl --since "2 minutes ago"
-- Logs begin at sam. 2017-09-16 13:04:12 CEST, end at sam. 2017-09-16 13:28:46 CEST. --
sept. 16 13:28:22 andree NetworkManager[813]: <info>  [1505561302.2591] device (wlp2s0): Activation: starting connection 'Livebox-8AA4' (xxxx)
sept. 16 13:28:22 andree NetworkManager[813]: <info>  [1505561302.2598] audit: op="connection-activate" uuid="xxxx" name="Livebox-8AA4" pid=1489 uid=1000 result="success"
sept. 16 13:28:22 andree NetworkManager[813]: <info>  [1505561302.2609] device (wlp2s0): state change: disconnected -> prepare (reason 'none') [30 40 0]
sept. 16 13:28:22 andree NetworkManager[813]: <info>  [1505561302.5561] device (wlp2s0): state change: prepare -> config (reason 'none') [40 50 0]
sept. 16 13:28:22 andree NetworkManager[813]: <info>  [1505561302.6302] device (wlp2s0): Activation: (wifi) access point 'Livebox-8AA4' has security, but secrets are required.
sept. 16 13:28:22 andree NetworkManager[813]: <info>  [1505561302.6303] device (wlp2s0): state change: config -> need-auth (reason 'none') [50 60 0]
sept. 16 13:28:23 andree NetworkManager[813]: <warn>  [1505561303.4255] device (wlp2s0): No agents were available for this request.
sept. 16 13:28:23 andree NetworkManager[813]: <info>  [1505561303.4256] device (wlp2s0): state change: need-auth -> failed (reason 'no-secrets') [60 120 7]