return null;
        SmbTransportImpl transport = getReferralTransport(tf, getDcReferrals(tf, domain));
        if ( transport == null && log.isDebugEnabled() ) {
            log.debug(String.format("Failed to connect to domain controller for %s", domain));
        }
        return transport;
    }


    private static SmbTransportImpl getReferralTransport ( CIFSContext tf, DfsReferralData dr ) throws SmbAuthException {