[Php Nuke Sentinel] Problema.

Salve a tutti ragazzi e buona sera, ho riscontrato che 2 miei amici vorrebbero accedere al mio sito ma ogni volta provano ad accedere gli appare questo msg:
You have been blocked from entering this site.

You have attempted an unknown attack on this site.

All of the following information has been gathered to assist the webmaster should this need to be reported to local or federal law enforcement.

If you think this is a mistake you can contact the site webmaster at Moto1:5(at)motounoacinque(dot)it.

User Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.6) Gecko/20100630 Ubuntu/8.04 (hardy) Firefox/3.6.6
Remote Address: 10x.xxx.xxx.xx
Client IP: none
Forwarded For: none
Date Blocked: __TIMEDATE__
Block expires: __DATEEXPIRES__

non sò come agire... sapete aiutarmi?? Grazie in anticipo