FIX for Capistrano's SSH error "Net::SSH::AuthenticationFailed error". This is a common error that you might encounter when working with Capistrano from one environment to another especially if Capistrano is configured to deploy on a password-less authentication.

deploy.rb

  #
  # FIX for Capistrano's SSH error "Net::SSH::AuthenticationFailed error"
  # This is a common error that you might encounter when working with Capistrano from one environment to another,
  # especially if Capistrano is configured to deploy on a password-less authentication.
  # 
  # The fix: specify the authentication eg. auth_methods
  #
  set :ssh_options, {:forward_agent => true, :auth_methods => 'publickey'}