idle_server.js

net = require('net');
connections = 0;

var errors = 0;

server = net.Server(function (socket) {

  socket.on('error', function () {
    errors++; 
  });

});

//server.maxConnections = 128;

server.listen(9000);

var oldConnections, oldErrors;

setInterval(function () {
  if (oldConnections != server.connections) {
    oldConnections = server.connections;
    console.log("SERVER %d connections: %d", process.pid, server.connections);
  }

  if (oldErrors != errors) {
    oldErrors = errors;
    console.log("SERVER %d errors: %d", process.pid, errors);
  }
}, 1000);