var ftpC = new FTPClient();
  ftpC.on('ready', function () {
    console.log('Connection successful!');
  });

  ftpC.on('error', function (err) {
    console.log(err);
  });

  console.log('Try to connect to FTP Server...');
  ftpC.connect({
    host: HOST_TO_CONNECT,
    port: 990,
    secure: 'implicit',
    user: '***',
    password: '***',
    secureOptions: {
      rejectUnauthorized: false
      // secureProtocol: 'SSLv23_method',
      // ciphers: 'ECDHE-RSA-AES128-GCM-SHA256'
    }
  })