I finnally (after hours ;)) been able to make it work on my virtualhost.
My new question is how can i configure the whole thing in order to get
http://blog.mydomain.com/
http://blog.mydomain.com/my_subdomain1/
http://blog.mydomain.com/my_subdomain2/...
instead of
http://mydomain.com/my_subdomain1/
http://mydomain.com/my_subdomain2/...
Thanks by advance
Cédric
I would think that would work since http://www.mydomain.com works as a setup.
When you set it up, you just have to tell it to use subdirectories and you have to install it in the subdirectory that http://blog.mydomain.com is pointed to.
The issue though would be how your websever does virtualhosts. If you have mydomain.com setup as a virtual host and then blog.mydomain.com as one as well, that's some hefty redirects in there.