i cannot login Mantis by User AD, i had config :

please help me.

You can simply change this at will. Mantis will try to figure out how the passwords were encrypted.

$g_login_method = LDAP;
$g_allow_signup = ON;
$g_ldap_server = 'LDAP://xxxx.com.vn';
$g_ldap_port = '389'; # 636 for LDAP over SSL
$g_ldap_root_dn = 'CN=mantis,CN=Users,DC=xxxxxx,DC=com,DC=vn';
$g_ldap_organization = '(objectClass=*)';
$g_ldap_uid_field = 'sAMAccountName'; # Use 'sAMAccountName' for Active Directory
$g_ldap_bind_dn = 'CN=mantis,CN=Users,DC=xxxxxxxx,DC=com,DC=vn'; # Username
$g_ldap_bind_passwd = 'xxxxxxx'; # Password
$g_use_ldap_email =OFF; # Should we send to the LDAP email address or what MySql tells us
$g_show_realname = ON;
$g_ldap_protocol_version = 3;
$g_use_ldap_realname = ON;
$g_ldap_realname_field = 'cn';