我基本上有同样的问题：
Symfony 2 - 加载 Web 调试工具栏时出错（404：未找到）
尽管该解决方案对我不起作用。
除了 / 之外，我的所有路线都没有工作，当我去 '/' 时，我得到了上述错误。
runningphp app/console router:debug显示我所有的路线都被很好地列出，但实际上访问它们会导致 404。
我的 .htaccess 是
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI}::$1 ^(/.+)/(.*)::\2$
RewriteRule ^(.*) - [E=BASE:%1]
RewriteCond %{ENV:REDIRECT_STATUS} ^$
RewriteRule ^app_dev.php(/(.*)|$) %{ENV:BASE}/$2 [R=301,L] ##### this is the part that you should tweak, have the .htaccess point the request to app_dev.php, since the routing.yml is empty initially
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule .? - [L]
RewriteRule .? %{ENV:BASE}/app_dev.php [L] ##### this is the part that you should tweak, have the .htaccess point the request to app_dev.php, since the routing.yml is empty initially
</IfModule>
<IfModule !mod_rewrite.c>
<IfModule mod_alias.c>
# When mod_rewrite is not available, we instruct a temporary redirect of
# the startpage to the front controller explicitly so that the website
# and the generated links can still be used.
RedirectMatch 302 ^/$ /app.php/
# RedirectTemp cannot be used instead
</IfModule>
</IfModule>