Ldapsearch
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HOWTO
ldapsearch using starttls
ldapsearch -x -ZZ -h ldap.example.com
ldapsearch example
ldapsearch -x -XX -h ldap.example.com -b "dc=example,dc=com" -D "CN=Admin,dc=Users,dc=example,dc=com" -W
look up person
ldapsearch -x -XX -h ldap.example.com -b "dc=example,dc=com" -D "CN=Admin,dc=Users,dc=example,dc=com" "(&(objectclass=person)(uid=harry))" -W
check server certificate starttls
openssl s_client -connect ldap.example.com:389 -starttls ldap
or
gnutls-cli --starttls-proto=ldap --print-cert -p 389 ldap.example.com