我尝试过这里推荐的：Passenger: internal server error，但在config.ru中没有找到STDOUT的引用
我在ruby-2.0.0-p247和乘客（4.0.17）
尝试加载页面后的控制台输出：
[2013-09-16 14：34：07.3648 4197 / b72beb40 Pool2 / Spawner.h：738]：[App 4435 stdout]连接到database.yml指定的数据库[2013-09-16 14：35：37.4570 4197 / b72beb40 Pool2 / Implementation.cpp：849]：无法为group / media / sf_John / product生成进程#default：启动预加载器时出错：它没有及时写入启动响应。 'std中的'void Passenger :: ApplicationPool2 :: SmartSpawner :: throwPreloaderSpawnException（const std :: string＆，Passenger :: SpawnException :: ErrorKind，boost :: shared_ptr＆，const boost :: shared_ptr＆）'（SmartSpawner.h：150） :: string Passenger :: ApplicationPool2 :: SmartSpawner :: negotiatePreloaderStartup（Passenger :: ApplicationPool2 :: SmartSpawner :: StartupDetails＆）'（SmartSpawner.h：558）'void Passenger :: ApplicationPool2 :: SmartSpawner :: startPreloader（）'（ SmartSpawner.h：206）'void Passenger中的'虚拟Passenger :: ApplicationPool2 :: ProcessPtr Passenger :: ApplicationPool2 :: SmartSpawner :: spawn（const Passenger :: ApplicationPool2 :: Options＆）'（SmartSpawner.h：744） ApplicationPool2 :: Group :: spawnThreadRealMain（const Passenger :: ApplicationPool2 :: SpawnerPtr＆，const Passenger :: ApplicationPool2 :: Options＆，unsigned int）'（Implementation.cpp：782）
[2013-09-16 14：35：37.4578 4197 / b60fdb40 agents / HelperAgent / RequestHandler.h：1952]：[客户端20]无法结账会话。启动预加载器时发生错误：它没有及时写入启动响应。
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actionmailer (3.2.14, 3.2.13)
actionpack (3.2.14, 3.2.13)
active_hash (1.0.1, 0.9.14)
activemodel (3.2.14, 3.2.13)
activerecord (3.2.14, 3.2.13)
activeresource (3.2.14, 3.2.13)
activesupport (3.2.14, 3.2.13)
acts_as_paranoid (0.4.2)
addressable (2.3.5, 2.3.4)
american_date (1.1.0)
arbre (1.0.1)
arel (3.0.2)
attr_required (0.0.5)
bcrypt-ruby (3.1.2, 3.1.1, 3.0.1)
better_errors (0.9.0)
binding_of_caller (0.7.2)
bourbon (3.1.8)
builder (3.0.4)
bundler (1.3.5)
bundler-unload (1.0.1)
cancan (1.6.10)
capybara (2.1.0)
childprocess (0.3.9)
chronic (0.10.0, 0.9.1)
chunky_png (1.2.8)
cliver (0.2.1)
coderay (1.0.9)
coffee-rails (3.2.2)
coffee-rails-source-maps (1.3.6, 1.3.5)
coffee-script (2.2.0)
coffee-script-source (1.6.3, 1.6.2)
compass (0.12.2)
compass-rails (1.0.3)
crack (0.4.1, 0.4.0)
daemon_controller (1.1.4)
daemons (1.1.9)
dalli (2.6.4)
database_cleaner (1.1.1, 0.9.1)
debug_inspector (0.0.2)
devise (3.0.3, 3.0.2, 3.0.1, 2.2.4)
devise_oauth2_providable (1.1.2)
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dotenv (0.8.0)
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eventmachine (1.0.3)
excon (0.25.3, 0.23.0)
execjs (2.0.1, 1.4.0)
factory_girl (4.2.0)
factory_girl_rails (4.2.1)
faraday (0.8.8)
faraday_middleware (0.9.0)
fastercsv (1.5.5)
ffaker (1.18.0, 1.16.1)
ffi (1.9.0)
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haml (4.0.3)
haml-rails (0.4)
has_scope (0.6.0.rc, 0.5.1)
highline (1.6.19)
hike (1.2.3)
httpclient (2.3.4.1, 2.3.3)
i18n (0.6.5, 0.6.4, 0.6.1)
inherited_resources (1.4.1, 1.4.0)
journey (1.0.4)
jquery-rails (2.3.0)
jquery-ui-rails (4.0.4, 4.0.3)
json (1.7.7)
jwt (0.1.8)
kaminari (0.14.1)
kgio (2.8.0)
kramdown (1.1.0, 1.0.2)
launchy (2.3.0)
listen (1.3.0, 1.2.2)
lumberjack (1.0.4)
mail (2.5.4)
mail_view (1.0.3)
meta_search (1.1.3)
method_source (0.8.2, 0.8.1)
mime-types (1.24, 1.23)
mini_magick (3.6.0)
mini_portile (0.5.1)
mock_redis (0.9.0, 0.8.2, 0.7.0)
modernizr-rails (2.6.2.3)
modular-scale (1.0.6)
mono_logger (1.1.0)
multi_json (1.7.9, 1.7.8, 1.7.7)
multipart-post (1.2.0)
mysql2 (0.3.13, 0.3.11)
net-scp (1.1.2, 1.1.1)
net-ssh (2.6.8, 2.6.7)
newrelic_rpm (3.6.6.147, 3.6.3.111)
nokogiri (1.6.0, 1.5.10)
oily_png (1.1.0)
orm_adapter (0.4.0)
paper_trail (2.7.2)
passenger (4.0.17)
polyamorous (0.5.0)
polyglot (0.3.3)
pry (0.9.12.2)
quiet_assets (1.0.2)
rack (1.5.2, 1.4.5)
rack-cache (1.2)
rack-oauth2 (0.11.0)
rack-protection (1.5.0)
rack-ssl (1.3.3)
rack-test (0.6.2)
rails (3.2.14, 3.2.13)
railties (3.2.14, 3.2.13)
raindrops (0.11.0)
rake (10.1.0)
rb-fsevent (0.9.3)
rb-inotify (0.9.1, 0.9.0)
rb-kqueue (0.2.0)
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redis (3.0.4)
redis-namespace (1.3.1, 1.3.0)
request_store (1.0.5)
responders (1.0.0.rc, 0.9.3)
resque (1.24.1)
resque_mailer (2.2.4)
rspec (2.14.1)
rspec-core (2.14.5, 2.14.4, 2.14.3)
rspec-expectations (2.14.2, 2.14.0)
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rspec-mocks (2.14.3, 2.14.2, 2.14.1)
rspec-rails (2.14.0)
ruby-hmac (0.4.0)
ruby-progressbar (1.2.0, 1.1.1)
rubygems-bundler (1.2.2)
rvm (1.11.3.8)
safe_yaml (0.9.5, 0.9.4, 0.9.3)
sass (3.2.10, 3.2.9)
sass-rails (3.2.6)
sassy-math (1.5)
shoulda-matchers (2.3.0, 2.2.0)
simple_form (2.1.0)
simplecov (0.7.1)
simplecov-html (0.7.1)
sinatra (1.4.3)
slop (3.4.6, 3.4.5)
spork-rails (3.2.1)
sprockets (2.2.2)
stamp (0.5.0)
state_machine (1.2.0)
subexec (0.2.3)
thin (1.5.1)
thor (0.18.1)
tilt (1.4.1)
travis-artifacts (0.1.0)
treetop (1.4.15, 1.4.14)
turnip (1.1.0)
twilio-ruby (3.10.1, 3.9.0)
typhoeus (0.6.5, 0.6.4, 0.6.3)
tzinfo (0.3.37)
uglifier (2.2.0, 2.1.2, 2.1.1)
unicorn (4.6.3, 4.6.2)
valid_attribute (1.3.1)
vcr (2.5.0)
vegas (0.1.11)
verbs (2.1.3)
warden (1.2.3, 1.2.1)
webmock (1.11.0)
websocket-driver (0.2.3, 0.2.1)
whenever (0.8.4, 0.8.2)
xpath (2.0.0)
对我来说，它有效
cd <usr name>
rails new myapp
sudo bundle install
mkdir /home/<user name>/myapp
chmod 701 /home/myapp
chmod -R 705 /home/<user name>/myapp
chgrp -R www-data /home/<user_name>/myapp
chown -R <user_name> /home/<user_name>