You might want to check if this guy is a member on any of your sites and cancel his access...

Matteo Crippa
Belgioioso
Milano, XX 20121
Italy
Email: mamacan@tiscali.it
IP Address: 151.30.25.167
Username: mamacan

I just terminated his membership today after noticing an above average amount of failed requests from the site he joined.

Seems he was sharing his password using one of those referrer anonymizer services, that was enough for me to warrant cancelling his access.

Regards,

Lee