Hi Warren,

To fix this just run the fake authentication WHILE airodump-ng is running against the target network as shown in the course, so run airodump-ng using the –channel and –bssid arguments against the target network, keep it running, and run the fake authentication from another terminal window.

For the ARP replay injection, try to re-enable monitor mode again:

ifconfig wlan0 down
airmon-ng check kill
iwconfig wlan0 mode monitor
ifconfig wlan0 up

Make sure that you’re on the right frequency band since the AWUS036ACH supports two bands:

airodump-ng wlan0
airodump-ng –band abg wlan0 (For 2.4 & 5Ghz networks)
airodump-ng –band a wlan0 (Only for 5Ghz networks)

In addition, try the following when you connect the adapter before you enable monitor mode:
– Experiment with connecting the adapter before and after Kali fully loads, and after you log in as root.
– Experiment with setting the adapter to use USB 2.0 and 3.0 in Kali system settings in Vbox.
– Make sure you connect the adapter directly to the computer, don’t use a hub or an extension.
– And experiment with connecting the adapter to different USB ports.

Last but not least, try to enable monitor using another method: