Redmine

I'm also having the same issue with below Environment.

• Environment:
  • apache: 2.2.24
  • PHP: 5.4.14
  • Redmine version: 2.3.1
  • Ruby version: 1.9.3 (i386-mingw32)
  • Rails version: 3.2.13
  • Database adapter: Mysql2
  • Perl: v5.16.3(mod_perl 2.0.8)
  • svn: 1.7.9

Same here: new installation of Ubuntu 12.04 VM and clean Redmine installation, following that tutorial.

Environment:
apache2 2.2.22
Redmine 2.3.1.stable.11961
Ruby version 1.8.7 (x86_64-linux)
Rails version 3.2.13
Database adapter: Postgresql
perl 5.14.2-6ubuntu2.3
svn 1.6.17

Hope this will help finding a solution.

UPDATE/Solved: I don't know if it will fix you problems as well: I made the following mistake by not following this given rule:
Redmine.pm: "=head1 REPOSITORIES NAMING

A projet repository must be named with the projet identifier. In case
of multiple repositories for the same project, use the project identifier
and the repository identifier separated with a dot:

/var/svn/foo
  /var/svn/foo.otherrepo

"

By showing "AuthUserFile not specified in the configuration" Redmine and the Apache log lead me to a complete wrong path for searching. But this was the mistake found by a collegue of mine. Corrected it and it works fine. Hope this works for you too. Please let me know. Greetings.

For the record, I had the same error in my Apache log with git. It was because a user was trying to authenticate using DOMAIN\login instead of login (ActiveDirectory authentication).