[Dovecot] Dovecot Ldap Logs

Hello all!

One question about ldap. In my logs im see this:

Info: auth(default): ldap(sysadmin@domain.off,172.16.1.80): user search: base=dc=CAS scope=subtree filter=(&(objectClass=mailUser)(mail=sysadmin@domain.off)) fields=(all)

Info: auth(default): ldap(sysadmin@domain.off,172.16.1.80): result: accountStatus(?unknown?)= cn(?unknown?)= givenName(?unknown?)= initials(?unknown?)= l(?unknown?)= o(?unknown?)= objectClass(?unknown?)= telephoneNumber(?unknown?)= sn(?unknown?)= title(?unknown?)= uid(?unknown?)= userPassword(?unknown?)= mail(?unknown?)=

What is that mean? And how can im get a rid of this?

-- Best regards, Proskurin Kirill