ladp access problem

Hi,

I have problem trying to configure NMS to make use of MS AD to authenticate
users.
The following tow image files showing my AD structure (user nms1 as a member
of NMS group):

http://opennms.530661.n2.nabble.com/file/n7580468/nms_group.jpg 
http://opennms.530661.n2.nabble.com/file/n7580468/nms_user.jpg 

and below is my ldap configuration in
applicationContext-spring-security.xml.

  
    <beans:bean id="contextSource"
class="org.springframework.security.ldap.DefaultSpringSecurityContextSource">
        <beans:constructor-arg
value="ldap://10.30.90.13:389/dc=SBST,dc=NOBE" />
        <beans:property name="userDn" value="username"/>
        <beans:property name="password" value="password"/>
    </beans:bean>

  
    <beans:bean id="ldapAuthProvider"
class="org.springframework.security.providers.ldap.LdapAuthenticationProvider">
        <custom-authentication-provider />      
		
        <beans:constructor-arg ref="ldapAuthenticator"/>
        <beans:constructor-arg ref="ldapAuthoritiesPopulator"/>
    </beans:bean>