openldap client configuration to connect to AD

Hi  Trying to configure ldap client connection for AD,  in the ldap.conf , what configuration needs to be carried, like is it required for PAM & NSS configuration .tried to test in ldap command as initial test, but getting the below error, ./ldapsearch -x -W -h 10.10.10.10 -b "CN=testuser,OU=Users,OU=KeyPairIN,OU=KeyPair,DC=keypair,DC=internal" -S subEnter LDAP Password:  ***   ldap_sasl_bind(SIMPLE): Can't contact LDAP server (-1)Please do know what needs to be included ThanksSantosh Sr Software developer