apache and nss volumes

I am using OES with linux kernal and apache2. I have finally been
able to
get mod_auth_ldap to work but I am having a problem when I want to
point to
an nss volume. For example I have two folders second one is an nss
volume.
When I point to an nss volume I am also not prompted for a username or

password. Any ideas?

This works
Alias /trial1/ "/var/web/"

<Directory "/var/web">
Options Indexes FollowSymLinks
AllowOverride None
Order allow, deny
Allow from all
AuthType Basic
AuthName webusers
AuthLDAPAuthoritative on
AuthLDAPUrl "ldap://myserver.com:389/ou=people,o=example?cn"
require valid-user
</Directory>

This one does not work
Alias /trial2/ "/media/nss/SOFT/web/"

<Directory "/media/nss/SOFT/web">
Options Indexes FollowSymLinks
AllowOverride None
Order allow, deny
Allow from all
AuthType Basic
AuthName webusers
AuthLDAPAuthoritative on
AuthLDAPUrl "ldap://myserver.com:389/ou=people,o=example?cn"
require valid-user
</Directory>