[Badger(new)]

you could do:

pawn Код:

#define NEW_MAX_PLAYERS 64
// replace 64 with the ammount you want

public OnPlayerConnect(playerid)
{
  new p;
  for(new i; i<NEW_MAX_PLAYERS;i++)
  {
    if(IsPlayerConnected(i);p++;
  }
  if(p>=64){SendClientMessage(playerid,0xFF0000AA,"This server is full. Try again later."); Kick(playerid);}
  return 1;
}

However it wouldn't keep trying to connect the player, it would just kick them.