[FuNkYTheGreat]

Код:

forward KickPlayer(playerid);
public KickPlayer(playerid)
{
        new pname[MAX_PLAYER_NAME], string[128];
        GetPlayerName(playerid, pname, sizeof(pname));
        format(string, sizeof(string), "{AFAFAF}%s {FF0000}has tried to login in RCON and got Kicked!", pname);
        SendClientMessageToAll(COLOR_RED, string);
        Kick(playerid);
        return 1;
}

You were looping through MAX_PLAYERS and then were kicking them all,
Try that one, and change that

Код:

KickPlayer();

To

Код:

KickPlayer(playerid);