// no credentials
                return !fessConfig.isLdapAuthValidation();
            }
            final Hashtable<String, String> env = createAdminEnv();
            try (DirContextHolder holder = getDirContext(() -> env)) {
                final DirContext context = holder.get();
                if (logger.isDebugEnabled()) {
                    logger.debug("Logged in as Bind DN. {}", context);
                }