protected final Map<Long, Response> response_map = new ConcurrentHashMap<>(10);
    private final AtomicLong usageCount = new AtomicLong(1);


    /**
     * @return session increased usage count
     */
    public Transport acquire () {
        long usage = this.usageCount.incrementAndGet();
        if ( log.isTraceEnabled() ) {

    /**
     * 
     * @return negotiated multiplex count
     */
    public int getNegotiatedMpxCount () {
        return this.maxMpxCount;
    }


    /**
     * 
     * @return negotiated session key
     */
    public int getNegotiatedSessionKey () {
        return this.sessionKey;
    }


    /**
     * {@inheritDoc}
     *

    }

    /**
     * The real session key if the regular session key is actually
     * the encrypted version used for key exchange.
     *
     * @return A <code>byte[]</code> containing the session key.
     */
    public byte[] getMasterKey() {
        return masterKey;
    }

    /**
     * Returns the session key.
     *

class SessionRetargetResponsePacket extends SessionServicePacket {

    private NbtAddress retargetAddress;
    private int retargetPort;

    SessionRetargetResponsePacket() {
        type = SESSION_RETARGET_RESPONSE;
        length = 6;
    }

    int writeTrailerWireFormat( byte[] dst, int dstIndex ) {
        return 0;
    }
    int readTrailerWireFormat( InputStream in,

    int getMaximumBufferSize () throws CIFSException;


    /**
     * @return whether the session uses SMB signing
     * @throws CIFSException
     * @throws SmbException
     */
    boolean areSignaturesActive () throws CIFSException;


    /**
     * Internal/testing use only
     * 
     * @return attached session
     */
    SmbSession getSession ();

            /*
             * Session Setup And X Request / Response
             */
    
            if( transport.log.level >= 4 )
                transport.log.println( "sessionSetup: accountName=" + auth.username + ",primaryDomain=" + auth.domain );
    
            /* We explicitly set uid to 0 here to prevent a new
             * SMB_COM_SESSION_SETUP_ANDX from having it's uid set to an

    /**
     * Indicates datagram authentication.
     */
    public static final int NTLMSSP_NEGOTIATE_DATAGRAM_STYLE = 0x00000040;

    /**
     * Indicates that the LAN Manager session key should be used for
     * signing and sealing authenticated communication.
     */
    public static final int NTLMSSP_NEGOTIATE_LM_KEY = 0x00000080;

    /**

     */
    public SmbComSessionSetupAndX ( CIFSContext tc, SmbComNegotiateResponse negotiated, ServerMessageBlock andx, Object cred )
            throws SmbException, GeneralSecurityException {
        super(tc.getConfig(), SMB_COM_SESSION_SETUP_ANDX, andx);
        this.negotiated = negotiated;
        this.capabilities = negotiated.getNegotiatedCapabilities();
        ServerData server = negotiated.getServerData();

            this.openFlags &= ~(SmbFile.O_CREAT | SmbFile.O_TRUNC);
        } else {
            file.connect0();
        }
        readSize = Math.min( file.tree.session.transport.rcv_buf_size - 70,
                            file.tree.session.transport.server.maxBufferSize - 70 );
    }

    protected IOException seToIoe(SmbException se) {
        IOException ioe = se;
        Throwable root = se.getRootCause();

        SmbTreeConnection treeConn = SmbTreeConnection.create(tc);
        try ( SmbTreeHandleImpl th = treeConn.connectHost(locator, locator.getServerWithDfs());
              SmbSessionImpl session = th.getSession();
              SmbTransportImpl transport = session.getTransport() ) {
            try {
                entries = doMsrpcShareEnum(tc, locator, transport.getRemoteAddress());
            }
            catch ( IOException ioe ) {