Raspberry Pi SSH wpa_supplicant.conf Fix
After a power outage, I was suddenly not able to SSH into my Raspberry Pi. It's a Raspberry Pi 2 model B with Raspbian Stretch Lite (2017-08-16).
So I did a fresh install, added a
wpa_supplicant.conf file an an empty
ssh file to the
/boot directory of the SD card as usual but it was still not connecting to my router.
I followed this guide to connect my Mac directly to the Raspberry Pi using ethernet cable. Essentially, I had to enable network sharing on the Mac, use
ifconfig to find my IP address, use
nmap -n -sP 192.168.2.1/24 to find the Raspberry Pi's IP then SSH in as normal:
ssh pi@<ip address> (default password raspberry).
Then, this recent post on the Raspberry Pi forum helped. Running
sudo journalctl revealed that things were misconfigured:
Aug 16 01:22:14 raspberrypi dhcpcd-run-hooks: wlx74da380f9771: ctrl_interface not defined in /etc/wpa_supplicant/wpa_supplicant.conf
Aug 16 01:22:14 raspberrypi dhcpcd: wlx74da380f9771: not interacting with wpa_supplicant(8)
Long story short, it's possible that a recent update to Raspbian Stretch Lite requires a new
wpa_supplicant.conf format that looks like this:
<psk> section is no longer the actual WiFi password. I had to generate the
network portion of the config using a command:
$ wpa_passphrase <ssid> <psk> and manually prepend the first three lines for the Raspberry Pi to auto-connect to my WiFi.