stange log

I am seeing the log messages below on my openldap installation:

@(#) $OpenLDAP: slapd 2.4.23 (Jun 28 2011 17:55:44) $ @gustav.cpd.ufv.br:/usr/ports/pobj/openldap-2.4.23/build-amd64/servers/slapd Backend ACL: access to dn.subtree="cn=monitor" by dn.base="cn=oldap,dc=ufv,dc=br" read by * none

Backend ACL: access to * by * none

config_back_db_open: line 0: warning: cannot assess the validity of the ACL scope within backend naming context slapd starting

What does it mean? How may i avoid these messages ? What do i need to fix ?

Thanks once more.