SQLmap da erro ao digitar codigo?

rafaelarcanjo
(usa Kali)

Enviado em 30/06/2016 - 07:37h

root@Rafael:~# sqlmap -u http://testphp.vulnweb.com/search.php?test=query --dbs
_
___ ___| |_____ ___ ___ {1.0-dev-nongit-201606290a89}
|_ -| . | | | .'| . |
|___|_ |_|_|_|_|__,| _|
|_| |_| http://sqlmap.org

[!] legal disclaimer: Usage of sqlmap for attacking targets without prior mutual consent is illegal. It is the end user's responsibility to obey all applicable local, state and federal laws. Developers assume no liability and are not responsible for any misuse or damage caused by this program

[*] starting at 07:28:14

[07:28:16] [INFO] testing connection to the target URL
[07:28:17] [INFO] checking if the target is protected by some kind of WAF/IPS/IDS
[07:28:20] [INFO] testing if the target URL is stable
[07:28:20] [INFO] target URL is stable
[07:28:20] [INFO] testing if GET parameter 'test' is dynamic
[07:28:30] [WARNING] GET parameter 'test' does not appear dynamic
[07:28:33] [INFO] heuristic (basic) test shows that GET parameter 'test' might be injectable (possible DBMS: 'MySQL')
[07:28:34] [INFO] testing for SQL injection on GET parameter 'test'
it looks like the back-end DBMS is 'MySQL'. Do you want to skip test payloads specific for other DBMSes? [Y/n] Y
for the remaining tests, do you want to include all tests for 'MySQL' extending provided level (1) and risk (1) values? [Y/n] Y
[07:28:53] [INFO] testing 'AND boolean-based blind - WHERE or HAVING clause'
[07:29:50] [INFO] testing 'AND boolean-based blind - WHERE or HAVING clause (MySQL comment)'
[07:30:20] [CRITICAL] connection dropped or unknown HTTP status code received. Try to force the HTTP User-Agent header with option '--user-agent' or switch '--random-agent'. sqlmap is going to retry the request(s)

Glr da esse erro como resolve???
quando digitei o comando perguntou Y/n? duas vezes então eu digitei Y, ai começa analisar só que no final aparece esse erro CRITICAL como resolve?