How can I block unknown hacker in Mexico (200.94.131.226) ?

fwiw, here's (maybe) his url: static-200-94-131-226.alestra.net.mx C:\WINDOWS>ping -a 200.94.131.226 Pinging static-200-94-131-226.alestra.net.mx [200.94.131.226] with 32 bytes of d ata: Reply from 200.94.131.226: bytes=32 time=123ms TTL=51 Ping statistics for 200.94.131.226: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 110ms, Maximum = 123ms, Average = 119ms I believe you can block specific urls and ips using your firewall settings, unless he has established a back-door entry and/or masked his true url/ip. (I'm not much good at security, I'm sure the security forum will give you much better advice).