Why do I receive an error when trying to change a user password using ldappasswd with Red Hat Directory Server?

Issue

• Trying to change users password results in the following error:

# ldappasswd -x "uid=username,ou=People,dc=example,dc=com" -Z
ldap_start_tls: Protocol error (2)
     additional info: unsupported extended operation
Result: Confidentiality required (13)
Additional info: Operation requires a secure connection.