ldap and WP Multisites

hi there

i configured word press multisite on my network

i connect it to Active directory using a plugin

once the user log in , a site is created: http://blogs.com/blogs/user
when I browse to that site, it gives me an HTTP 404 error.

The main site is accessible.

am not sure what hoes wrong
i want my site tree to look like :
http://blogs.com/user1
http://blogs.com/user2

kindly help me , am stuck in this infinte loop for 2 weeks

my httacces:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /blogs/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /blogs/index.php [L]
</IfModule>

RewriteEngine On
RewriteBase /blogs/
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

# END WordPress