newbie q about 'access'

["Alexsey L. Nagorniy" <A.Nagorniy@Palma-Group.com>]

Hallo

I decide to use ldap server for serving pgp keys.
So i installed openldap21-server from freebsd ports and set up slapd.conf.
Then, I started slapd and initialized database with init.ldif
Next, i use pgp 8.0 to create and send keys to server.
And here is a trouble:
Jan 13 16:50:27 gw slapd[42360]: conn=3 fd=13 ACCEPT from
                    IP=192.168.230.32:2167 (IP=192.168.230.1:389)
Jan 13 16:50:27 gw slapd[42360]: conn=3 op=0 ADD
            dn="pgpCertID=3631AEB186896855,dc=palma,dc=net"
Jan 13 16:50:27 gw slapd[42360]: conn=3 op=0 RESULT tag=105 err=8
            text=modifications require authentication
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Jan 13 16:50:27 gw slapd[42360]: conn=3 op=1 UNBIND
Jan 13 16:50:27 gw slapd[42360]: conn=3 fd=13 closed

=========> slapd.conf <==============
include         /usr/local/etc/openldap/schema/core.schema
include         /usr/local/etc/openldap/schema/pgp-keyserver.schema

pidfile         /var/run/openldap/slapd.pid
argsfile        /var/run/openldap/slapd.args
sockbuf_max_incoming    524288

database    bdb
suffix      "ou=PGP Keys,dc=palma,dc=net"
rootdn      "cn=admin,ou=PGP Keys,dc=palma,dc=net"
rootpw      {MD5}S0F3ecDS6Oq/+7KlVIznMQ==
directory       /var/db/openldap-data
index       objectClass        eq
index  pgpCertID,pgpKeyID,pgpKeyType,pgpUserID,pgpKeyCreateTime
                    sub,eq
index  pgpSignerID,pgpSubKeyID,pgpKeySize,pgpKeyExpireTime
                    sub,eq
index  pgpDisabled,pgpRevoked                                      eq

access to *
      by * write
=========> slapd.conf <==============

=========> init.idif <==============
dn: ou=PGP Keys,dc=palma,dc=net
objectclass: organizationalUnit
ou: PGP Keys

dn: cn=PGPServerInfo,ou=PGP Keys,dc=palma,dc=net
cn: PGPServerInfo
objectclass: pgpserverinfo
pgpSoftware: OpenLDAP slapd
pgpVersion: 2.0.23
pgpBaseKeyspaceDN: ou=PGP Keys,dc=palma,dc=net
=========> init.ldif <==============

Why its require authentication, when i told, that all users have write
permissions?
Maybe you can give me few hints.