ec2 + unicorn + nginxでデプロイしたい

unicornとnginxを使ってec2インスタンスにデプロイしたいと思っています。
unicornとnginx の起動は確認しているのですが、ブラウザからIPアドレスでwebページにアクセスするとうまく表示されません。　We're sorry, but something went wrong.と出てしまいます。
クローンしたアプリがうまく表示されていないようです。。。
パーミッションは確認済です。pathも合っています

/etc/nginx/conf.d/hoge_app.conf


error_log  /var/www/rails/hoge_app/log/nginx.error.log;
access_log /var/www/rails/hoge_app/log/nginx.access.log;
# max body size
client_max_body_size 2G;
upstream app_server {
  # for UNIX domain socket setups
  server unix:/var/www/rails/hoge_app/tmp/sockets/.unicorn.sock fail_timeout=0;
}
server {
  listen 80;

  server_name 18.177.251.97;
  # nginx so increasing this is generally safe...
  keepalive_timeout 5;

  # path for static files
  root /var/www/rails/hoge_app/public;
    location = /favicon.ico {
        access_log off;
        log_not_found off;
    }

  location ~ ^/assets/ {
        gzip_static on;
        expires 1d;
  }
  # page cache loading
  location / {
  try_files $uri/index.html $uri.html $uri @app;
  }
 location @app {
    # HTTP headers
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://app_server;
  }
  # Rails error pages
     error_page 404 /404.html;
        location = /404.html {
    }

  error_page 500 502 503 504 /500.html;
  location = /500.html {
    root /var/www/rails/hoge_app/public;
  }
}

/etc/nginx/nginx.conf


events {
    worker_connections 1024;
}

http {
    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;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

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

    include /etc/nginx/conf.d/*.conf;

    index   index.html index.htm;

/var/www/rails/hoge_app/config/unicorn.conf.rb


$worker  = 2
$timeout = 30
$app_dir = "/var/www/rails/hoge_app"
$listen  = File.expand_path 'tmp/sockets/.unicorn.sock', $app_dir
$pid     = File.expand_path 'tmp/pids/unicorn.pid', $app_dir
$std_log = File.expand_path 'log/unicorn.log', $app_dir
# set config
worker_processes  $worker
working_directory $app_dir
stderr_path $std_log
stdout_path $std_log
timeout $timeout
listen  $listen
pid $pid
# loading booster
preload_app true
# before starting processes
before_fork do |server, worker|
  defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect!
  old_pid = "#{server.config[:pid]}.oldbin"
  if old_pid != server.pid
    begin
      Process.kill "QUIT", File.read(old_pid).to_i
    rescue Errno::ENOENT, Errno::ESRCH
    end
  end
end
# after finishing processes
after_fork do |server, worker|
  defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
end