WPS Nack issue

[GoogleCodeExporter]

Answer the following questions for every issue submitted:

0. What version of Reaver are you using?  (Only defects against the latest
version will be considered.)
1.4

1. What operating system are you using (Linux is the only supported OS)?
Kali Linux

2. Is your wireless card in monitor mode (yes/no)
Yes

3. What is the signal strength of the Access Point you are trying to crack?
-61

4. What is the manufacturer and model # of the device you are trying to
crack?
Fastweb ADB DV2200 (WPS enabled)

5. What is the entire command line string you are supplying to reaver?
reaver -i mon0 -b XX:XX:XX:XX:XX:XX -a -vv -d 2 -N -E -S


6. Please describe what you think the issue is.
It always send WSC Nack next to M4 message. Tried PIN until 90.20%, then in 
blocked on the PIN 99985673.

Please help, I can't make it work, I tried many re aver options, read almost 
all of the previous posts but I just can't make it work :( the router is mine, 
I'm not trying to crack anybody's router :)

Original issue reported on code.google.com by [email protected] on 8 Feb 2015 at 5:26