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I just installed Arch Linux.

Wifi worked fine for me on installation but as soon as I rebooted, I received failure messages when trying to connect to my router. When trying to access my router through wifi-menu, I receive:

Job for netctl@wls1\x2d2WIRE740.service failed. See 'systemctl status netctl@wls1\x2d2WIRE740.service and journalctl -xn' for details.

systemctl status netctl@wls1\x2d2WIRE740.service says:

Loaded: loaded (/usr/lib/systemmd/system/netctl@.service; static)
Active: inactive (dead)
Docs: man:netctl.profile(5)

journalctl -xn says:

-- Unit netctl@wls1\x2d2WIRE740.service has begun starting up.
Jan 01 06:40:43 termin01 network[2002]: Starting network profile 'wls1-2WIRE740' ...
Jan 01 06:40:43 termin01 network[2002]: The interface of network profile 'wls1-2WIRE740' is already up
Jan 01 06:40:43 termin01 systemd[1]: netctl@wls1\x2d2WIRE740.service:main process exited. code=exited, status=1/FAILURE
Jan 01 06:40:43 termin01 systemd[1]: Failed to start Automatically generated profile by wifi-menu.
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did you try a second or third time? sometimes I find that that helps. – strugee Jan 2 '14 at 1:34
Use anything other than netctl, like wicd for example. – jasonwryan Jan 2 '14 at 2:01
I use netctl and it works fine for me, better even than wicd. I use netctl and netctl-auto to automatically connect to an available network – Ikke Jun 12 '14 at 12:41
Just a guess but netctl conflicts with networkmanager. You need to stop the networkmanager service, if you have it enabled. – StrongBad Aug 13 '15 at 16:53

It looks as if the profile you are trying to connect to is not in range, or arch is not able to connect to it. Perhaps you should take a look at the documentation and try to configure it again. I currently use it, but it doesn't connect to random networks if they are open, it only connects to recognized SSID's that I have a profile for.

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