need help in limiting amount of data per sec on a particular sever and port

hi all i hope you can help me, i enjoy useing yahoo as millions of other people around the world, however an exploit has been found wich nasty and vindictive persons have found to attack the yahoo server and port you are useing, so i was wondering if i can limite the amount of data recieved on that server and port to prevent the flooding, and if so how can i do it? any help is appreciated
thnx kev