Redmine

Hi,
I'm having some troubles when logging in/out after migration from an old server on Win2k with RM 1.3.1 to a Win2008 r2 with RM 1.4.4
Log-in works, but only if I do not check the checkbox "remember me". If I do check it, or when I want to log off, I've got a "Bad Gateway" error from apache.

The apache log says :

[proxy_http:warn] [pid 3740:tid 1092] [client 127.0.0.1:53647] AH01106: bad HTTP/1.1 header returned by /redmine/login (POST), referer: http://127.0.0.1/redmine/login

I modified environment.rb to add

Redmine::Utils::relative_url_root = "/redmine" 

at the end of the file.
I've added "mongrel.rb" and "patch_for_mongrel.rb" in the config/initializers folder (with my rails version added at the first line).

I tried to add gemfile.local as said in RE: redmine 1.4 can not use mongrel? but it's breaking whole the redmine website.

Here is my configuration :

• Windows 2008 R2 x64
• MySql 5.5.27
• apache 2.2.16 (Win32)
• 2 mongrel services on 3001 & 3002
• proxy balancer (on "/redmine")
• ruby 1.8.7 p302 with :
  • actionmailer (2.3.14)
  • actionpack (2.3.14)
  • activerecord (2.3.14)
  • activeresource (2.3.14)
  • activesupport (2.3.14)
  • bundler (1.2.1)
  • cgi_multipart_eof_fix (2.5.0)
  • coderay (1.0.8)
  • daemons (1.1.9)
  • eventmachine (1.0.0 x86-mingw32)
  • fastercsv (1.5.5)
  • gem_plugin (0.2.3)
  • i18n (0.4.2)
  • mongrel (1.2.0.pre2 x86-mingw32)
  • mongrel_service (0.3.4 i386-mswin32)
  • mysql (2.8.1 x86-mingw32)
  • net-ldap (0.3.1)
  • rack (1.1.3)
  • rails (2.3.14)
  • rake (0.9.2.2)
  • ruby-openid (2.1.8)
  • thin (1.5.0)
  • tzinfo (0.3.33)
  • win32-service (0.5.2 mswin32)
• output of script/about:
  

  About your application's environment
  Ruby version              1.8.7 (i386-mingw32)
  RubyGems version          1.3.7
  Rack version              1.1.3
  Rails version             2.3.14
  Active Record version     2.3.14
  Active Resource version   2.3.14
  Action Mailer version     2.3.14
  Active Support version    2.3.14
  Application root          E:/www/redmine
  Environment               production
  Database adapter          mysql
  Database schema version   20120301153455
  

Thanks for help.