Java SSH 工具 : SftpClient error: The remote computer disconnected: Protocol error: packet too long: 65580

Question

当我尝试执行时，我收到“信息:远程计算机已断开连接:协议(protocol)错误:数据包太长:65580”错误:

sUpload("server.host.com", "username", "/home/localuser/.ssh/id_rsa", "filename", "");

文件不会传输到 SFTP 服务器(另一端仅创建零字节)。当通过 Unix shell 手动进行 SFTP 时，一切正常。我在网上读到，这可能是 SftpClient 中 BLOCK_SIZE 的问题，但首先我找不到更改大小的 setter 方法，其次，默认值似乎是 65535，这完全不能解释错误中的 65580 值消息。

有什么想法吗？

我有以下使用 Java Ssh 工具 (j2ssh-core-0.2.9.jar) 的实用方法:

private static void sUpload(String ftpServer, String user, String password,
String localFile, String remoteFile) throws IOException {
    String methodName = "sUpload: ";
    System.out.println(" START ftpServer="+ftpServer+" user="+user+" password="+password);

    int result = 0;
    System.out.println("ftpServer " + ftpServer);
    System.out.println("user  " + user);
    System.out.println("password  " + password);
    System.out.println("localFile " + localFile);
    System.out.println("remoteFile    " + remoteFile);

    SshClient ssh = new SshClient();

    ssh.connect(ftpServer);

    System.out.println("Server Connected  ");
    if (password.contains("\\") || password.contains("/")) {

        PublicKeyAuthenticationClient pk = 
            new PublicKeyAuthenticationClient();

        pk.setUsername(user);
        // Open up the private key file
        SshPrivateKeyFile file = SshPrivateKeyFile
                .parse(new File(password));
        SshPrivateKey key = file.toPrivateKey(null);
        pk.setKeyfile(password);
        pk.setKey(key);
        // Try the authentication
        result = ssh.authenticate(pk);

    } else {

        // Create a password authentication instance
        PasswordAuthenticationClient pwd = 
            new PasswordAuthenticationClient();
        // Get the users name
        pwd.setUsername(user);
        // Get the password
        pwd.setPassword(password);

        // Try the authentication
        result = ssh.authenticate(pwd);
    }

    System.out.println("Result fromssh.authenticate(pwd) " + result);
    // Evaluate the result
    if (result == AuthenticationProtocolState.COMPLETE) {

        // The connection is authenticated we can now do some real work!
        SftpClient sftp = ssh.openSftpClient();       
        System.out.println("openSftpClient");
        // Upload a file
        if(remoteFile != null && remoteFile.trim().length() > 0){
            sftp.put(localFile, remoteFile);
            System.out.println("======== no remote ======================================== file transfer success =======================================================================");
        }
        else    {
            System.out.println("================================================ file transfer starting =======================================================================");
            sftp.put(localFile);
            System.out.println("================================================ file transfer success =======================================================================");
        }


        // Quit
        sftp.quit();
        ssh.disconnect();
    }
    System.out.println(" END ");
}

Answer 1

ssh 客户端应告诉服务器所需的最大数据包大小是多少，并且服务器应遵守规范。

尝试不同的服务器并检查您自己服务器的最大数据包大小的配置。