[Konstantinos]

I'm not sure if you can use password via SendRconCommand. Anyways:

pawn Код:

CMD:lockserver(playerid, params[])
{
    if(!IsPlayerLoggedIn(playerid)) return SendClientMessage(playerid, COLOR_GREY, "You need to login first before using any command.");
    if(isnull(params)) return SendClientMessage(playerid, COLOR_WHITE, "[Usage]: /lockerserver [password]");
    new string[128];
    format(string, sizeof(string), "password %s", params);
    SendRconCommand(string);
    format(string, sizeof(string), "AdmCmd : %s %s has Locked The Server (PASSWORD: %s) ", RPALN(playerid), RPN(playerid), params);
    SendAdminMessage(COLOR_RED, 1, string);
    format(string, sizeof(string), "AdmCmd: %s has locked the server.", RPN(playerid));
    SendClientMessageToAll(COLOR_LIGHTRED, string);
    return 1;
}