can't chang password via simple authentication

hi,guys

I can't chang user password via simple authentication at ldap client.

I have set acl rule in slapd.conf.

access to attr=userPassword

by self write

by anonymous auth

by dn.base="cn=Manager,dc=abc,dc=com" write

by * none

access to *

by self write

by dn.base"cn=Manager,dc=abc,dc=com" write

by * read

ldappasswd -x -D "uid=bobliu,ou=it,dc=abc,dc=com" -W -S

New password:

Re-enter new password:

Enter LDAP Password:

ldap_bind: Invalid credentials (49)

but can use ldapsearch via simple authentication.

what about problem. thks