No such file or directory - bind(2) (Errno::ENOENT) about capistrano-puma HOT 4 CLOSED

# config valid only for Capistrano 3.1
lock '3.2.1'

# ---------------------------------------------------------------------

server 'server', roles: %w{web app db}

set :application,     'app_name'
set :user,            'deployer'

set :repo_url,        "[email protected]:asgerb/#{fetch(:application)}.git"
set :git_enable_submodules, 1

set :bundle_flags,    '--verbose'
set :chruby_ruby,     'rubinius-2.2.10'

set :shared_path,     '~/public_html/enbiun'

set :pty, true
set :linked_files,    %w{config/secrets.yml}
set :linked_dirs,     %w(public/system)

# ---------------------------------------------------------------------

set :ssh_options, { :forward_agent => true }

# ---------------------------------------------------------------------

set :normalize_asset_timestamps, false

set :rails_env,   "production"
set :deploy_to,   "/home/#{fetch(:user)}/public_html/#{fetch(:application)}"
set :branch,      "master"