Haking server

Helo friends please help in this matter , i have a haker problem and the solution is still unknown i use No.ip.for my website

my website is on my windowsxp with my server

i have port bloker and i have blok this ports
http://www.imageupload.org/thumb/thumb_74108.jpg

i have sygatefirewall and i have block this
http://www.imageupload.org/thumb/thumb_74109.jpg

and after all this this guy still can shutdown the website for a short time i did not ask for longer time and can change my server status connection from (space) to full server , and can make a error on the server that apear to me like Send / dont Send (This is shut down for the server)

Alsow i have MTT 1.0 and i have a problem with mobs somtimes , they sotop to respawn and a error apears with Send/Dontsend , on my Gameserver , this will automatic shutdown the server will not d/c the online players but if you are disconnected you cannot rejoin the server

Wat i can doo ?