(111: Connection refused) while connecting to upstream というエラーがでてしまい、railsアプリケーションが表示できません。

awsからさくらのクラウドにサーバー移行しています。

awsのamazonLinaxでは正常に動作していました。

$bundle exec unicorn_rails -c config/unicorn.rb -E production -D
$sudo systemctl start nginx

上の二つのコマンドはエラーなしで実行できるのですが、ブラウザで確認すると
表示されていません。

 環境

さくらのクラウド CentOS7
Ruby : ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux]
Rails :4.2.3

nginx + unicorn 

でrailsアプリケーションの環境を構築しています。

実行コマンド
$ bundle exec unicorn_rails -c config/unicorn.rb -E production -D
$sudo systemctl start nginx

 エラー

2016/02/21 09:55:02 [error] 3988#0: *1 connect() to unix:/home/ユーザー名/アプリ名/tmp/unicorn.sock failed (111: Connection refused) while connecting to upstream, client: ローカルip, server: 127.0.0.1, request: "GET /api/v1/music_threads HTTP/1.1", upstream: "http://unix:/home/ユーザー名/アプリ名/tmp/unicorn.sock:/api/", host: "ipアドレス"

 設定ファイル

 /etc/nginx/conf.d/local.conf

upstream unicorn {
  server unix:/home/ユーザー名/アプリ名/tmp/unicorn.sock;
}

server {
  listen 80 default_server;
  server_name 127.0.0.1;

  access_log  /var/log/nginx/ユーザー名_access.log;
  error_log /var/log/nginx/ユーザー名_error.log;

  root /home/ユーザー名/アプリ名/public;

  client_max_body_size 100m;
  error_page 404 /404.html;
  error_page 500 502 503 504 /500.html;
  try_files $uri/index.html $uri.html $uri @unicorn;

  location @unicorn {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_pass http://unicorn;
    #proxy_pass http://ipアドレス;
  }
}

config/unicorn.rb

rails_root = File.expand_path('../../shared', __FILE__)

worker_processes Integer(ENV["WEB_CONCURRENCY"] || 3)
timeout 15
preload_app true

#listen "#{rails_root}/tmp/unicorn.sock"
#pid "#{rails_root}/tmp/unicorn.pid"
listen "#{rails_root}/tmp/unicorn.sock"
pid "#{rails_root}/tmp/unicorn.pid"

before_fork do |server, worker|
  Signal.trap 'TERM' do
    puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
    Process.kill 'QUIT', Process.pid
  end

  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!
end

after_fork do |server, worker|
  Signal.trap 'TERM' do
    puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT'
  end

  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.establish_connection
end

stderr_path File.expand_path('log/unicorn.log', ENV['RAILS_ROOT'])
stdout_path File.expand_path('log/unicorn.log', ENV['RAILS_ROOT'])

 /etc/nginx/nginx.conf

user  root;
worker_processes  1;
worker_rlimit_nofile 20480;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;
    # --- add--
    include /etc/nginx/sites-enabled/*;
}