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I am configuring my Zero to connect to wifi in advance. My steps are:

  • Format SD card with SDFormatter
  • Burn Raspbian Jessie with Win32DiskImager
  • Mount the SDCard in Windows with Paragon ExtFs For Windows
  • Modify /etc/network/interfaces

auto wlan0 allow-hotplug wlan0 iface wlan0 inet dhcp wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

  • Modify /etc/wpa_supplicant/wpa_supplicant.conf

network={ ssid="my network name" psk="my network password" proto=RSN key_mgmt=WPA-PSK pairwise=CCMP auth_alg=OPEN }

  • Connect a wifi dongle via OTG
  • Power on via USB cable to the laptop
  • Find the IP with SoftPerfect NetworkScanner
  • ssh in with Putty
  • Reboot with sudo reboot now

After waiting a few minutes to reboot I can no longer find the IP on my network scanner.

Unplugging and reboot has no effect either.

I have done it several times and each time I start for the first time I can ssh in (and even VNC in). However, as soon as I restart I can't connect.

Is there a log somewhere of the boot process to help understand why the second boot doesn't connect to wifi but the first does?

EDIT: Following the comments I checked the files again. This morning they were both full of NULLs (binary?) so I changed them to the new setup as mentioned by @Milliways.

I restarted, connected to wifi, did sudo reboot now and the following was in wpa_supplicant:

:38 raspberrypi dhcpcd[436]: dev: loaded udev
May 22 04:22:38 raspberrypi systemd[1]: Started getty on tty2-tty6 if dbus and 

And the following was in the interfaces file:

: Starting system-ifup.slice.
May 22 04:22:38 raspberrypi systemd[1]: Created slice system-ifup.slice.
May 22 04:22:38 raspberrypi console-setup[264]: Setting up console font and keymap...done.
May 22 04:22:38 raspberrypi systemd[1]: Started LSB: Set console font and keymap.
May 22 04:22:38 raspberrypi wpa_supplicant[372]: Successfully initialized wpa_supplicant
May 22 04:22:38 raspberrypi wpa_supplicant[373]: wlan0: Trying to associate with SSID 'RHAP1'
May 22 04:22:38 raspberrypi wpa_supplicant[373]: wlan0: Associated with 00:1e:13:1c:04:30
May 22 04:22:38 

Why is my Pi logging to the configuration files???

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  • Can you check the sd card after reboot with your Windows PC, to see if your changes have been undermined by the Pi after a reboot? Commented May 22, 2016 at 5:47
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    What you have would have been unreliable under Wheezy and is obsolete on Jessie (although it may work if the network was available at boot). You should do it in a more robust manner. See How do I set up networking/WiFi/Static IP
    – Milliways
    Commented May 22, 2016 at 7:35

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