return false;
            }
            domain = domain.toLowerCase(Locale.ROOT);
            return domains.get(domain) != null;
        }
    }

    private DfsReferralData getDcReferrals(final CIFSContext tf, final String domain) throws SmbAuthException {
        if (tf.getConfig().isDfsDisabled()) {
            return null;
        }
        final String dom = domain.toLowerCase(Locale.ROOT);