After booting the 2013-09-01 image of Arch Linux, I literally run just systemctl stop dhcpcd.service followed by wifi-menu -o. It finds the network (It shows up as an entry <SSID> + wpa 10, in case that's relevant), but after copying the password from another machine in the same location it always says it can't connect:

The rest of the message suggests two debugging commands. journalctl -xn says it tried to authenticate thrice, then:

Worth noting is that the machine is dual boot, and using the same network with the same device on Windows works just fine.

The wireless device is an Edimax EW-7811UN 150Mbps Wireless Nano USB Adapter, and shows up as follows:

and according to dmesg it's loaded the rtl8192cufw driver for this device.

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