Redmine

Recently I tried to configure git integration by following the step in [[http://www.redmine.org/projects/redmine/wiki/HowTo_configure_Redmine_for_advanced_git_integration#Known-issues]]
and [[http://wiki.bitnami.com/Applications/BitNami_Redmine/BitNami_Redmine_legacy#How_to_configure_Redmine_for_advanced_integration_with_Git]].
The first 3 steps are all right, I can clone the repository through port 8080. But cloning repositories through port 80 lead to an error like this:

luofl@BitnamiGit:~/gitest/bb$ git clone http://127.0.0.1/git/t1
cloning to 't1'...
fatal: repository 'http://127.0.0.1/git/t1/' not found

Are there anything need to be configured like grack? I'm not clear.>
Here is my environment:

Environment:
  Redmine version                2.5.2.stable
  Ruby version                   2.0.0-p481 (2014-05-08) [i686-linux]
  Rails version                  3.2.19
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.8.8
  Git                            1.9.0
  Filesystem                     
Redmine plugins:
  no plugin installed