APEX

Hello,
Im trying to configure my app with ad authentication. by searching on web i got many ideas. Im trying to execute below code but its fails when i assign a value to ldap_passwd* it throws an error saying

ORA-31202: DBMS_LDAP: LDAP client/server error: Invalid credentials. 80090308: LdapErr: DSID-0C0903A9, comment: AcceptSecurityContext error, data 52e, v1db0

with null its executes but it returns zero (0).

where am i doing wrong?


declare
retval pls_integer;
my_session dbms_ldap.session;
ldap_host varchar2(256);
ldap_port varchar2(256);
ldap_user varchar2(256);
ldap_passwd varchar2(256);

begin
ldap_host := 'ad_host' ;
ldap_port := '389';
ldap_user := 'cn=user';
ldap_passwd:= null;

my_session := dbms_ldap.init(ldap_host,ldap_port);
retval := dbms_ldap.simple_bind_s(my_session,ldap_user, ldap_passwd);

dbms_output.put_line(rpad('simple_bind_s Returns ',25,' ') || ': '|| to_char(retval));
end;

thank you.