I'm trying this command with reaver :
reaver -i wlan0mon -b xx:xx:xx:xx:xx:xx -d 90 -S -N -vv
[!] WARNING: Detected AP rate limiting, waiting 60 seconds before re-checking
(WPS in AP turns locked until restarted) or
[+] Sending EAPOL START request [!] WARNING: Receive timeout occurred [!] WARNING: 25 successive start failures
with every AP I tried. Is there something wrong with the command or is this normal ?