Rails 3.1 smtp gmail Errno::ECONNREFUSED Connection refused

application_after.rb

Demo::Application.configure do
  # ...
  config.action_mailer.delivery_method :smtp
  config.action_mailer.smtp_settings = {
    enable_starttls_auto: true,
    address: 'smtp.gmail.com',
    port: 587,
    authentication: 'plain',
    user_name: '<[email protected]>',
    password: '<password>'
  }
  # ...
end

application_before.rb

Demo::Application.configure do
  # ...
  config.action_mailer.delivery_method :smtp
  config.action_mailer.smtp_settings = {
    enable_starttls_auto: true,
    address: 'smtp.gmail.com',
    port: 587,
    domain: 'gmail.com',
    authentication: 'plain',
    user_name: '<[email protected]>',
    password: '<password>'
  }
  # ...
end

error

Errno::ECONNREFUSED in TestController#create

Connection refused - connect(2)