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.
sudo iwconfigand any relevant messages from/var/log/syslog. – mgorven Jul 10 '12 at 4:41