View Full Version : Ralink Wireless Card problem

2013-04-05, 16:54
root@Alias:~# ifconfig wlan0 up
SIOCSIFFLAGS: Operation not possible due to RF-kill

root@Alias:~# lspci | grep Network
03:00.0 Network controller: Ralink corp. RT5390 Wireless 802.11n 1T/1R PCIe

root@Alias:~# airmon-ng start wlan0

Found 1 processes that could cause trouble.
If airodump-ng, aireplay-ng or airtun-ng stops working after
a short period of time, you may want to kill (some of) them!
PID Name
2405 NetworkManager

Interface Chipset Driver

wlan0 Unknown rt2800pci - [phy0]SIOCSIFFLAGS: Operation not possible due to RF-kill

(monitor mode enabled on mon1)
mon0 Unknown rt2800pci - [phy0]

root@Alias:~# airodump-ng mon0
ioctl(SIOCSIFFLAGS) failed: Operation not possible due to RF-kill


2013-04-08, 21:27
unplug your wired connection to remove the rfkill. some laptops auto-rfkill the wireless when plugged into ethernet. use rfkill -l to see if this is the case.

2013-07-20, 15:22
ohhh good one. But what is this rfkill. Ok I know what it does but why do we use it. I don't remember it in older backtrack. Seems to cause a lot of pain for a automated program.

2013-07-21, 08:15
rfkill is a small userspace tool to query the state of the rfkill switches, buttons and subsystem interfaces. Some devices come with a hard switch that lets you kill different types of RF radios: 802.11 / Bluetooth / NFC / UWB / WAN / WIMAX / FM. Some times these buttons may kill more than one RF type. The Linux kernel rfkill subsystem exposes these hardware buttons and lets userspace query its status and set its status through a /dev/rfkill. Given that at times some RF devices do not have hardware rfkill buttons rfkill the Linux kernel also exposes software rfkill capabilities that allows userspace to mimic a hardware rfkill event and turn on or off RF.

Also, sometimes certain devices may be soft/hard blocked and this is one way to unblock them.

2013-07-22, 16:38
Is used to enable or disable wireless devices. Simple.

Use : "man rfkill" and read it.


2013-09-08, 08:58
First, makesure you do sudo rfkill disable all and then sudo ifconfig wlan0 up justo be sure that's not going to be the issue.

Ok now go to the Applications drop down menu, then to system tools, then preferences, then System Settings. In here towards the bottom there is a Network icon. Click it to open your network settings and go to your wireless connections tab where you see that "Airplane Mode" is stuck on. Ok now toggle it off AND THEN STOP EVERYTHIG YOU ARE DOING--- and leave the network settings window open. With everything as-is, go up to the power menu and put the system on standby. Wait a few seconds for your computer to sleep. Now just move the mouse to wake it up and then hit the "enable wifi" switch/ button in the wifi control panel and hit your hardware wifi toggle key combo and it should all stick. I have done this with three different wifi cards, 2 atheros and one Broadcom. I also saw this problem with a standard Ubuntu installation on another computer. You may need to repeat this process again in the future.