How to BAN an IP and not have to deal with it reconnecting every second

[Raulzito]

This loser: 81.185.103.186 has some kind of script that automatically tries to reconnect to my server when he's kicked and banned.
I have to give him a slot so that I don't have to deal with a huge log file that reads "[dest: 81.185.103.186] IP in ban list" over and over again, and if I stop streaming its the same: "[dest: 81.185.103.186] server unavailable" repeateadly.

Is there a way so I don't have to deal with this?

Thanks