Redmine

hi, thanks for your tutorial, i follow all the steps and it seems that everything is fine, now i don't have a domain. i would use redmine locally. something like http://localhost/redmine
in redmine.conf i write this:

alias /redmine /var/www/html/redmine/public

<directory /var/www/html/redmine/public>
Options Indexes ExecCGI FollowSymLinks
Order deny,allow
allow from all
AllowOverride all
</directory>

when i try to see redmine homepage
http://127.0.0.1/redmine

i see the file list and i'm not able to execute redmine, maybe there's something wrong with the file dispatch.fcgi?

i use ruby 1.9.3
redmine 2.5
centos 6.7

i follow this tutorial: http://www.redmine.org/projects/redmine/wiki/install_Redmine_25x_on_Centos_65_complete