this.nativeOs = value;
        }

        value = props.getProperty("jcifs.smb.client.nativeLanMan");
        if (value != null) {
            this.nativeLanMan = value;
        }

        // Dialect version properties - these should throw exceptions for invalid values
        String minVersion = props.getProperty("jcifs.smb.client.minVersion");
        String maxVersion = props.getProperty("jcifs.smb.client.maxVersion");

    /** Set of commands that should not be used in compound requests */
    protected Set<String> disallowCompound;
    /** Minimum SMB dialect version to negotiate */
    protected DialectVersion minVersion;
    /** Maximum SMB dialect version to negotiate */
    protected DialectVersion maxVersion;
    /** Whether to require secure negotiate validation */
    protected boolean requireSecureNegotiate = true;

            negotiate(altPort, resp);
            port = altPort;
        }

        if (resp.dialectIndex > 10) {
            throw new SmbException("This client does not support the negotiated dialect.");
        }
        if ((server.capabilities & CAP_EXTENDED_SECURITY) != CAP_EXTENDED_SECURITY && server.encryptionKeyLength != 8
                && LM_COMPATIBILITY == 0) {

    /**
     * SMB command to disconnect from a tree share.
     */
    public static final byte SMB_COM_TREE_DISCONNECT = (byte) 0x71;

    /**
     * SMB command to negotiate protocol dialect.
     */
    public static final byte SMB_COM_NEGOTIATE = (byte) 0x72;

    /**
     * SMB command to setup a session with extended attributes.
     */