[DaRk_RaiN]

use a simple variable.
E.g:

pawn Код:

new Warns[MAX_PLAYERS];

Then in case of false login add

pawn Код:

Warns[playerid] ++;
if(Warns[playerid] =< 3)return SendClientMessage(playerid, -1, "3 false attempts will get you kicked");
if(Warns[playerid] == 3)return Kick(playerid);

Add this under OnPlayerConnect to avoid bugs

pawn Код:

Warns[playerid] =0;