Wpa_supplicant configuration file for open hidden network [duplicate]

Question

I am unable to connect to a open hidden network (without password) The network is the following (from iwlist wlan0 scan)

  Cell 0 - Address: 11:22:33:44:55:66
                    Channel:5
                    Frequency:2.### GHz (Channel 1)
                    Quality=50/70  Signal level=-42 dBm  
                    Encryption key:off
                    ESSID:""

What is the right wpa_supplicant.config to connect to this open hidden network?

In particular What is the key_mgmt field for this open network? (instead of WPA-PSK)

Wrong guess:

network={
ssid="11:22:33:44:55:66
scan_ssid=1
mode=0
proto=WPA2
key_mgmt=WPA-PSK
pairwise=CCMP
group=CCMP
auth_alg=OPEN
priority=1
psk=""
}

Answer 1

Put key-mgmt=NONE in your configuration file.

This stanza is reported to work (haven't tried myself personally though):

network={
    ssid="any"
    key_mgmt=NONE
}