代码挂起了从我自己的Shadowsocks代理获取远程标识的问题

Question

我编写了一个Java程序，尝试通过代理服务器连接到SFTP服务器。代理服务器是我已安装在本地网络中另一台计算机上的Shadowsocks服务器。我正在使用Java 8和j2ssh-maverick 1.5

我已经按照示例创建了j2ssh-maverick随附的SFTP代理连接。当我尝试与代理服务器建立第一个连接时，在尝试获取从未获得的远程标识的同时，执行在SshConnect类中挂起。

private void connect() throws ProcessorException {
    try {
        boolean useProxy = StringUtils.isNotBlank(System.getProperty("wwProxyHost"));
        if (useProxy) {
            String proxyHost = System.getProperty("wwProxyHost");
            int proxyPort = Integer.parseInt(System.getProperty("wwProxyPort", "1080"));
            logger.info("Connecting to SFTP server through proxy "+proxyHost+":"+proxyPort);
            String proxyUser = System.getProperty("wwProxyUser", null);
            SocketTransport socketTransport = new SocketTransport(proxyHost, proxyPort);
// Execution doesn't go beyong the line below
            SshClient proxySshClient = sshConnector.connect(socketTransport, proxyUser);
            if (StringUtils.isNotBlank(proxyUser)) {
                logger.debug("Trying to authenticate proxy server with user "+proxyUser);
                PasswordAuthentication proxyAuthentication = new PasswordAuthentication();
                proxyAuthentication.setPassword(System.getProperty("wwProxyPassword", ""));
                int proxyAuthResult = proxySshClient.authenticate(proxyAuthentication);
                if (proxyAuthResult != SshAuthentication.COMPLETE) {
                    throw new ProcessorException("Cannot authenticate proxy server "+proxyHost+":"+proxyPort+" with user "+proxyUser);
                }
                logger.debug("Proxy authentication completed");
            }

            SshTunnel tunnel = proxySshClient.openForwardingChannel(host, port, "127.0.0.1", 22, "127.0.0.1", 22, null, null);
            sshClient = sshConnector.connect(tunnel, user);
        } else {
            SocketTransport socketTransport = new SocketTransport(host, port);
            socketTransport.setTcpNoDelay(true);
            sshClient = sshConnector.connect(socketTransport, user);
        }
        PublicKeyAuthentication authentication = new PublicKeyAuthentication();
        SshPrivateKeyFile sshPrivateKeyFile = SshPrivateKeyFileFactory.parse(new FileInputStream(identity));

        int authResult = -1;
        if (sshPrivateKeyFile.isPassphraseProtected()) {
            throw new ProcessorException("Using passphrase protected key files not implemented");
        } else {
            SshKeyPair keyPair = sshPrivateKeyFile.toKeyPair(null);
            authentication.setPrivateKey(keyPair.getPrivateKey());
            authentication.setPublicKey(keyPair.getPublicKey());
            authResult = sshClient.authenticate(authentication);
        }
        if (authResult == SshAuthentication.COMPLETE && sshClient.isConnected()) {
            sftpClient = new SftpClient(sshClient);
            sftpClient.setTransferMode(SftpClient.MODE_BINARY);
        } else {
            throw new ProcessorException("Authentication didn't complete or SSH clients is not connected; (authResult=" + authResult + ", conected=" + sshClient.isConnected() + ")");
        }
    } catch (IOException | SshException | InvalidPassphraseException | SftpStatusException | ChannelOpenException e) {
        throw new ProcessorException("Cannot connect to " + host+":"+port, e);
    }

}

一段时间后，从输入流中读取-1，并引发SshException，声称“无法读取远程标识”。

这是来自堆栈跟踪：

Caused by: com.sshtools.ssh.SshException: Failed to read remote identification  [Unknown cause]
    at com.sshtools.ssh.SshConnector.getRemoteIdentification(SshConnector.java:355) ~[j2ssh-maverick-1.5.5.jar:?]
    at com.sshtools.ssh.SshConnector.connect(SshConnector.java:296) ~[j2ssh-maverick-1.5.5.jar:?]
    at com.sshtools.ssh.SshConnector.connect(SshConnector.java:169) ~[j2ssh-maverick-1.5.5.jar:?]

任何帮助将不胜感激