return getChallenge(tf, dc, 0);
    }


    @Override
    public byte[] getChallenge ( CIFSContext tf, Address dc, int port ) throws SmbException {
        try ( SmbTransportInternal trans = tf.getTransportPool()
                .getSmbTransport(tf, dc, port, false, !tf.getCredentials().isAnonymous() && tf.getConfig().isIpcSigningEnforced())
                .unwrap(SmbTransportInternal.class) ) {
            trans.ensureConnected();

                }
                else {
                    dc = getTransportContext().getNameServiceClient().getByName(this.domainController, true);
                    challenge = getTransportContext().getTransportPool().getChallenge(getTransportContext(), dc);
                }

                if ( ( ntlm = NtlmSsp.authenticate(getTransportContext(), req, resp, challenge) ) == null ) {
                    return null;

        ctx.getTransportPool().logon(ctx, ctx.getNameServiceClient().getByName(getTestServer()));
    }


    // #68
    @Test ( expected = SmbException.class )
    public void testPoolLogonFail () throws CIFSException, UnknownHostException {
        CIFSContext ctx = withTestNTLMCredentials(getContext());

            // https://lists.samba.org/archive/samba-technical/2009-August/066486.html
            // UniAddress addr = UniAddress.getByName(authDomain, true, tf);
            // SmbTransport trans = tf.getTransportPool().getSmbTransport(tf, addr, 0);
            try ( SmbTransport dc = getDc(tf, authDomain) ) {
                CacheEntry<Map<String, CacheEntry<DfsReferralDataInternal>>> entry = new CacheEntry<>(tf.getConfig().getDfsTtl() * 10L);

                    if ( log.isDebugEnabled() ) {
                        log.debug("Using exclusive transport for " + this);
                    }
                    this.exclusiveTransport = this.ctx.getTransportPool()
                            .getSmbTransport(this.ctx, host, loc.getPort(), true, loc.shouldForceSigning()).unwrap(SmbTransportInternal.class);
                    SmbTransportInternal trans = this.exclusiveTransport;

    }


    @Test
    public void testSingletonInit () {
        assertNotNull(this.context.getBufferCache());
        assertNotNull(this.context.getNameServiceClient());
        assertNotNull(this.context.getTransportPool());
        assertNotNull(this.context.getUrlHandler());
        assertNotNull(this.context.getCredentials());
    }


    @Test
    public void testCredentials () {

                }
            }
        });

        try {
            CIFSContext c = getContext();
            c = withTestNTLMCredentials(c);
            try ( SmbTransportInternal trans = c.getTransportPool().getSmbTransport(c, getTestServer(), 0, false, true)
                    .unwrap(SmbTransportInternal.class);
                  SmbSession sess = trans.unwrap(SmbTransportInternal.class).getSmbSession(c, getTestServer(), null);

                // connection should be closed by now
                assertTrue("Transport is still connected", t.isDisconnected());
                assertFalse("Connection is still in the pool", ( (SmbTransportPoolImpl) ctx.getTransportPool() ).contains(t));
            }
            finally {
                f.delete();
            }
        }

    }


    @Test ( expected = ConnectionTimeoutException.class )

                }

                req.getSession(); /* ensure session id is set for cluster env. */
                challenge = getTransportContext().getTransportPool().getChallenge(getTransportContext(), dc);
                if ( ( ntlm = NtlmSsp.authenticate(getTransportContext(), req, resp, challenge) ) == null ) {
                    return;
                }
            }