please take a look of nslcd debug trying the login using user "zingalo"
that is registered in the ldap server:
nslcd: [3c9869] DEBUG: connection from pid=3209 uid=0 gid=0
nslcd: [3c9869] DEBUG: nslcd_pam_authc("zingalo","","login","***")
nslcd: [3c9869] DEBUG: myldap_search(base="dc=amahoro,dc=bi", filter="(&(objectClass=posixAccount)(uid=zingalo))")
nslcd: [3c9869] DEBUG: ldap_initialize(ldap://192.168.5.219:389)
nslcd: [3c9869] DEBUG: ldap_set_rebind_proc()
nslcd: [3c9869] DEBUG: ldap_set_option(LDAP_OPT_PROTOCOL_VERSION,3)
nslcd: [3c9869] DEBUG: ldap_set_option(LDAP_OPT_DEREF,0)
nslcd: [3c9869] DEBUG: ldap_set_option(LDAP_OPT_TIMELIMIT,0)
nslcd: [3c9869] DEBUG: ldap_set_option(LDAP_OPT_TIMEOUT,0)
nslcd: [3c9869] DEBUG: ldap_set_option(LDAP_OPT_NETWORK_TIMEOUT,0)
nslcd: [3c9869] DEBUG: ldap_set_option(LDAP_OPT_REFERRALS,LDAP_OPT_ON)
nslcd: [3c9869] DEBUG: ldap_set_option(LDAP_OPT_RESTART,LDAP_OPT_ON)
nslcd: [3c9869] DEBUG: ldap_simple_bind_s("uid=nslcd_proc,ou=Users,dc=amahoro,dc=bi","***") (uri="ldap://192.168.5.219:389")
nslcd: [3c9869] DEBUG: ldap_result(): end of results
nslcd: [3c9869] "zingalo": user not found
what could i check again?