for (int j = 0; j < max; j++) {
                final int i = dcListCounter++ % max;
                if (this.dcList[i] != null) {
                    try {
                        return interrogate(getTransportContext(), this.dcList[i]);
                    } catch (final SmbException se) {
                        log.warn("Failed validate DC: " + this.dcList[i], se);
                    }

    static NbtAddress[] dc_list = null;
    static long dc_list_expiration;
    static int dc_list_counter;

    private static NtlmChallenge interrogate(final NbtAddress addr) throws SmbException {
        final UniAddress dc = new UniAddress(addr);
        final SmbTransport trans = SmbTransport.getSmbTransport(dc, 0);
        if (USERNAME == null) {