�No, it not a DNS error, it is most likely that you have no URI �parameter specified in /etc/openldap/ldap.conf, for more information �read man ldap.conf(5) and you definitely should read man ldapsearch(1)
Thank you and yes, you are right, this is what the problem was indeed. As for reading, as I've said, it's not like I've not been reading, needed leads to know where to go next.