Trying to get WiFi working on the Raspberry Pi 3 following the instructions found at https://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md when I got to start the WiFi using
sudo wpa_cli reconfigure
It reports an error:
Failed to connect to non-global ctrl_ifname: (null) error: No such file or directory
Error messages like this are great as they don’t provide any clue’s, anyway the fix for me was simple once found. Run:
sudo ifdown wlan0
This may error with a message
ifdown: interface wlan0 not configured
Don’t give up! Still run
sudo ifup wlan0
That fixed it for me. Hope it helps you too! 🙂
I’m using Raspbian GNU/Linux 8 (jessie). uname -a returns
Linux <hostname> 4.4.50-v7+ #970 SMP Mon Feb 20 19:18:29 GMT 2017 armv7l GNU/Linux