title: Magento2 setup destroys the session and logs out
body: <p>So I installed Magento 2.0.5 CE on a nginx machine. All went smoothly. I am now able to log in to admin panel and browse around.</p>
  
  <p>But as soon as i visit <a href="http://example.com/setup" rel="nofollow">http://example.com/setup</a> it redirects me to ../setup/index.php/session/unlogin, displaying the message "Access denied." and destroys the current session, forcing me to re-login to admin panel. Even after clearing all cache, restarting nginx and repeating above steps, same happens. Kinda stuck here now..</p>
  
  <pre><code>2016/04/29 06:41:47 [error] 4808#0: *188 FastCGI sent in stderr: "Access to the script '/var/www/magento/setup/index.php/session/unlogin' has been denied (see security.limit_extensions)" while reading response header from upstream, client: *.*.*.246, server: example.com, request: "GET /setup/index.php/session/unlogin HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "www.example.com"
  2016/04/29 06:41:48 [error] 4808#0: *188 FastCGI sent in stderr: "Access to the script '/var/www/magento/setup/index.php/session/unlogin' has been denied (see security.limit_extensions)" while reading response header from upstream, client: *.*.*.246, server: example.com, request: "GET /setup/index.php/session/unlogin HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "www.example.com"
  </code></pre>
  
  <p>Tried changing /etc/php5/fpm/pool.d/www.conf from</p>
  
  <pre><code>; security.limit_extensions = .php .php3 .php4 .php5
  </code></pre>
  
  <p>to</p>
  
  <pre><code>security.limit_extensions = .php .php3 .php4 .php5
  </code></pre>
  
  <p>No luck :( </p>
  
  <p>HELP!</p>