Redmine

Hello,

i want to install current stable Redmine on an existing Debian Jessie Server, running Apache2.
The Apache2 Root is /var/www.

I followed the tutorial except the install path, for this i used /var/www/redmine
http://www.redmine.org/projects/redmine/wiki/HowTo_Install_Redmine_on_Debian_8_with_Apache2-Passenger

Everything works until point 2.4.
With the Browser URL and ports i also see, that redmine is running correctly.

The Apache Passenger is loaded.

Then i made a new vhost:
/etc/apache2/sites-available/redmine.conf

<VirtualHost *:80>
  ServerName redmine.example.com
  DocumentRoot /var/www/redmine/public

  <Directory /var/www/redmine/public>
    AllowOverride all
    Options -MultiViews        
    Require all granted
  </Directory>
</VirtualHost>

But i only get a 403 Forbidden.
I have made for tests the complete /var/www/redmine Owner www-data and also chmod 777 but same.

Also i wrote "PassengerUser www-data" in passenger.conf.

Whats my failure???
Greets