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I have a headless Debian machine, with a Wifi dongle connected. I used to hide the Wifi AP, but now I can't.

If I unhide it, some lines in the /etc/network/interfaces will allow me to connect:

auto wlan0
iface wlan0 inet dhcp
        wpa-ssid <name>
        wpa-psk <hex/raw pwd>

If I hide the AP, add this line, then restart the interface, it won't work (DHCP gets no IP):

wpa-ap-scan 2

I've not found official documentation about the /etc/network/interfaces config.

What can I do now?

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up vote 7 down vote accepted

Finally, I've found out a solution, just an other line (previous not needed: wpa-ap-scan)

wpa-scan-ssid 1

I've not really found it in any documentation... just in a forum post.

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I found this by guessing too, I used wpa-scan_ssid 1. Also works. – Matt Joiner Sep 5 '13 at 6:31

I've not found official documentation about the /etc/network/interfaces config.

You can find the documentation at /usr/share/doc/wpasupplicant/README.Debian.gz. Under Chapter 4: Troubleshooting there's a section titled Hidden ssids:

In order to be able to associate to hidden ssids, please try to set the option 'ap_scan=1' in the global section, and 'scan_ssid=1' in your network block section of your wpa_supplicant.conf file. If you are using the managed mode, you can do so by these stanzas:

iface eth1 inet dhcp
    wpa-ap-scan 1
    wpa-scan-ssid 1
    # ... additional options for your setup
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