How to prevent the use of the accelerator players login game ？

Everybody is good.
recently I had met with a headache, a lot of players use the accelerator of my personal login server, cause my server expenses is very large, I hope someone can help me...
these!!!!!!!

Close the Port ?

Prevent the use of accelerator, what port should I close it?

Look into your source its not the same as mine.

You may not understand what I mean, I didn't say "ACC" attack, I said is a players use to speed up the game speed tool.