Negative fixed channel about wifi-cracking HOT 4 CLOSED

From the Aircrack-ng website:

If you are having issues injecting or if you are receiving an error message talking about channel -1 or fixed channel in airodump-ng (top right of the screen) or aireplay-ng, kill the network managers using "airmon-ng check kill" before putting the wireless card in monitor mode.

I would recommend running airmon-ng check first to see if it lists any processes that may need to be killed. If so, follow that with airmon-ng check kill. If that doesn't work, I've also had luck putting my device into monitor mode manually with:

sudo ifconfig wlan0 down
sudo iwconfig wlan0 mode monitor
sudo ifconfig wlan0 up

This method puts the device into monitor mode without creating a new mon0 virtual device, so be sure to use wlan0 where you would otherwise use mon0 for all of the tasks in the tutorial.

from wifi-cracking.

airmon-ng check kill worked like a charm. Thanks.

from wifi-cracking.

I have the same issue but none of solutions worked for me
I used airmon-ng check kill before putting wlan in monitor mode but the problem still remain.
and solution2 give me this error :

~# sudo iwconfig wlan0 mode monitor
Error for wireless request "Set Mode" (8B06) :
    SET failed on device wlan0 ; Operation not supported.

any idea?

from wifi-cracking.

It looks like your device may not support monitor mode. I'd recommend purchasing a compatible USB WiFi dongle from this list.

from wifi-cracking.