title: 302 status upon login form submission to login_check route
body: <p>Good evening,</p>
  
  <p>I recently installed symfony3, meaning I created my user entity, loaded user fixtures, set up firewall/provider/form_login entries in the security configuration file, as well as implementing a security controller to handle the /login route.</p>
  
  <p>I'm now stuck at trying to log in the application using the authentication mechanism embeded with SF.</p>
  
  <p>When hitting <code>/</code>, I get redirected to <code>/login</code>and the login form is being rendered as expected. But upon submission (to <code>/login_check</code>) via post method, SF replies with a 302 and redirects me back to the login form.</p>
  
  <p><code>/login_check</code> route is supposed to be handled by SF right ? So I expected some exception to arise, but none did though.</p>
  
  <p>Seams to be a firewall issue as enlightened in <a href="https://stackoverflow.com/questions/28088982/symfony2-6-login-check-goes-to-error-302-and-application-doesnt-connect">this thread</a>, but it did not help me.</p>
  
  <p>My security conf file:</p>
  
  <pre><code>security:
      encoders:
          AppBundle\Entity\User:
              algorithm: bcrypt
              cost: 12
      providers:
          ent_provider:
              entity:
                  class: AppBundle:User
                  property: email
      firewalls:
          dev:
              pattern: ^/(_(profiler|wdt)|css|images|js)/
              security: false
          login:
              pattern:   ^/(login|register|resetting)$
              security: false
              anonymous: ~
          app:
              pattern: ^/
              anonymous: false
              provider: ent_provider
              form_login:
                  login_path: /login
                  check_path: /login_check
  </code></pre>
  
  <p>Can someone please help me pointing out what's wrong with my security configuration ? (Or anything else ...)</p>
  
  <p>Thank you !</p>