Normally the error message in your subject is as a result of the server requiring encryption of some kind. For example, you might have set:
security tls=1
or similar, in which case you need to use ldaps:// or start_tls (-Z):
[bgmilne@comanche ~]$ ldapsearch -x -LLL "(uid=bgmilne)" 1.1 ldap_bind: Confidentiality required (13) additional info: TLS confidentiality required [bgmilne@comanche ~]$ ldapsearch -Z -x -LLL "(uid=bgmilne)" 1.1 dn: uid=bgmilne,ou=People,dc=ranger,dc=dnsalias,dc=com
Regards, Buchan