I am trying to integrate openstack kilo with active directory. if I give a

specific OU path ( ex: ou=Users,DC=local, DC=in ) as my user_tree_dn

then the integration is working fine and I am able to fetch all the user information. If I give

entire domain ( ex: DC=local, DC=in ) as my user_tree_dn

then I am getting an error and i am not able to fetch all the user list. in the specific OU path there are 45 users and in my domain path there are many organization units and total user list is around 900. The below error I am getting.

openstack user list

Error: An unexpected error prevented the server from fulfilling your request: {'info': 'Referral:\nldap://local.in/CN=Configuration,DC=local,DC=in', 'desc': "Can't contact LDAP server"}

Could you please help me in fixing this issue.