通过跳转主机连接到远程主机时获取java.net.ConnectException

Question

尝试使用JSch将文件传输到远程主机，但是必须通过跳转主机将其连接。我可以连接到跳转主机，但是在尝试连接到远程主机时出现异常。

我尝试通过在工作站上使用SSH命令进行验证，并且能够连接。在Java中，我尝试遵循以下步骤： JSch multiple tunnels/jumphosts

但是，我收到“线程“ main” com.jcraft.jsch.JSchException中的异常：java.net.ConnectException：连接被拒绝：connect”。下面是我的代码：

    String jumpHost = "sshgateway";
    String remoteHost = "cimtst1a";
    String jumpHostKnownHostsPath = "D:\\OpenSSH-Win64\\sshgateway_known_hosts";
    String remoteHostKnownHostsPath = "D:\\OpenSSH-Win64\\cimtst1a_known_hosts";
    String jumpHostUsername = "wsh";
    String jumpHostPassword = "adsf";
    String remoteHostUsername = "cim";
    String remoteHostPassword = "adsf";

    JSch jsch = new JSch();
    jsch.setKnownHosts(jumpHostKnownHostsPath);
    Session jumpHostSession = jsch.getSession( jumpHostUsername, jumpHost );
    jumpHostSession.setConfig(
            "PreferredAuthentications", 
            "publickey,keyboard-interactive,password"
            );
    jumpHostSession.setPassword( jumpHostPassword );
    jumpHostSession.connect();
    if(jumpHostSession.isConnected())
    {
        logger.info("Jumphost Session created to " + jumpHostSession.getHost() + " by " + jumpHostSession.getUserName());
    }

    int remoteHostSshPort = jumpHostSession.setPortForwardingL(0, remoteHost, 22);
    jsch.setKnownHosts(remoteHostKnownHostsPath);
    Session remoteHostSession = jsch.getSession( remoteHostUsername, remoteHost, remoteHostSshPort);
    remoteHostSession.setConfig(
            "PreferredAuthentications", 
            "publickey,keyboard-interactive,password"
    );
    remoteHostSession.setPassword( remoteHostPassword );
    remoteHostSession.connect();
    if(!remoteHostSession.isConnected())
    {
        System.out.println("connected~!");
    }