This is the relevant part of syslog:



Mar 19 00:03:31 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414211.4577] device (wlp58s0): Activation: starting connection 'MIWIFI_2G_y36Y' (602d6129-d306-4b63-9b96-aa042a710863)
Mar 19 00:03:31 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414211.4649] device (wlp58s0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Mar 19 00:03:31 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414211.4655] manager: NetworkManager state is now CONNECTING
Mar 19 00:03:31 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414211.4667] device (wlp58s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Mar 19 00:03:31 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414211.4675] device (wlp58s0): Activation: (wifi) access point 'MIWIFI_2G_y36Y' has security, but secrets are required.
Mar 19 00:03:31 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414211.4680] device (wlp58s0): state change: config -> need-auth (reason 'none', sys-iface-state: 'managed')
Mar 19 00:03:31 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414211.4686] sup-iface[0x56229b8baaf0,wlp58s0]: wps: type pbc start...
Mar 19 00:03:31 host-XPS-13-9350 NetworkManager[663]: <warn>  [1521414211.4707] device (wlp58s0): No agents were available for this request. *********************************************************
Mar 19 00:03:31 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414211.4780] device (wlp58s0): supplicant interface state: ready -> scanning

Mar 19 00:04:02 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414242.0905] device (wlp58s0): state change: need-auth -> failed (reason 'no-secrets', sys-iface-state: 'managed')
Mar 19 00:04:02 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414242.0914] manager: NetworkManager state is now DISCONNECTED




Mar 19 00:04:02 host-XPS-13-9350 NetworkManager[663]: <warn>  [1521414242.0929] device (wlp58s0): Activation: failed for connection 'MIWIFI_2G_y36Y'
Mar 19 00:04:02 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414242.0961] device (wlp58s0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')



Mar 19 00:04:41 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414281.9133] device (wlp58s0): Activation: starting connection 'MIWIFI_2G_y36Y' (602d6129-d306-4b63-9b96-aa042a710863)
Mar 19 00:04:41 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414281.9140] audit: op="connection-activate" uuid="602d6129-d306-4b63-9b96-aa042a710863" name="MIWIFI_2G_y36Y" pid=1079 uid=1000 result="success"
Mar 19 00:04:41 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414281.9147] device (wlp58s0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Mar 19 00:04:41 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414281.9153] manager: NetworkManager state is now CONNECTING
Mar 19 00:04:41 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414281.9169] device (wlp58s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Mar 19 00:04:41 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414281.9178] device (wlp58s0): Activation: (wifi) access point 'MIWIFI_2G_y36Y' has security, but secrets are required.
Mar 19 00:04:41 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414281.9179] device (wlp58s0): state change: config -> need-auth (reason 'none', sys-iface-state: 'managed')
Mar 19 00:04:41 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414281.9193] sup-iface[0x56229b8baaf0,wlp58s0]: wps: type pbc start...
Mar 19 00:04:41 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414281.9467] device (wlp58s0): state change: need-auth -> prepare (reason 'none', sys-iface-state: 'managed')
Mar 19 00:04:41 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414281.9475] device (wlp58s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Mar 19 00:04:41 host-XPS-13-9350 NetworkManager[663]: <info>  [1521414281.9682] device (wlp58s0): Activation: (wifi) connection 'MIWIFI_2G_y36Y' has security, and secrets exist.  No new secrets needed.



As you can see in the line where I put ****, the message says "No agents were available for this request". If I click on Disconnect and Connect that message doesn't appear in the logs and it works ok.