Ban ip

[tnrh1]

Is it possible to "ban" / "kill a connection" between 2 networks?
For example I'm the server and many clients are "connected" to me.
I want in java to be able to ban some of those client by ip, to stop the connection.
If the connection were started by me, by code that I've written I could just use a simple comparation to block some "black list".
So is it possible?I couldn't find any function that distroy a connection.

Thanks in advanced.

[tnrh1]

bump

[tnrh1]

really no one?