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I have the following entries in my interfaces file:

auto wlan0  
iface wlan0 inet dhcp  
    wireless-essid 12345678  
    wireless-keymode open

The wireless controller's ssid is hidden, but I know that it is the 12345678. There is no encryption on the wireless controller and no authentication. I can't connect to it.

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Please provide the output of sudo iwconfig and any relevant messages from /var/log/syslog. – mgorven Jul 10 '12 at 4:41

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