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我正在尝试设置代理隧道以提供静态 IP 地址以连接到一台 SFTP 服务器。我正在我的 Heroku 服务器上使用 QuotaGardStatic 附加组件进行尝试。我看到了一些教程，这是我与代理隧道连接的课程：

public class JsheExecutor {

       public static void go(InputStream targetStream) throws Exception {

          StringBuilder outputBuffer = new StringBuilder();

          String host = "hostOfThatSFTP"; // The host to be connected finally
          String user = "myUser";
          String password = "mypassword";
          int port = 22;

          String tunnelRemoteHost = "hostFromQuotaGardAddOn"; // The host from where the tunnel is created

          JSch jsch = new JSch();
          Session session = jsch.getSession(user, host, port);
          session.setPassword(password);
          java.util.Properties config = new java.util.Properties();
          config.put("StrictHostKeyChecking", "no");
          config.put("PreferredAuthentications", "password");

          ProxySOCKS5 proxyTunnel = new ProxySOCKS5(tunnelRemoteHost, 2222);
          proxyTunnel.setUserPasswd("quotaguardUser", "quotaguardpass");
          session.setProxy(proxyTunnel);
          session.setTimeout(3600000);
          session.connect();

          Channel channel=session.openChannel("sftp");

            channel.setInputStream(targetStream);

            InputStream stdout=channel.getInputStream();

            channel.connect();

            while (true) {
                byte[] tmpArray=new byte[1024];
                while(stdout.available() > 0){
                    int i=stdout.read(tmpArray, 0, 1024);
                    if(i<0)break;
                    outputBuffer.append(new String(tmpArray, 0, i));
                 }
                if(channel.isClosed()){
                    System.out.println("exit-status: "+channel.getExitStatus());
                    break;
                 }
            }
          stdout.close();

          channel.disconnect();

          session.disconnect();

          System.out.println(outputBuffer.toString());
       }

    }

但我总是error at=error code=H12 desc="Request timeout" method=POST path="/mybrocki/auth/users/export" host=be.minibrocki.ch request_id=28ada120-7c8d-4261-adcf-d105d27067bb fwd="213.208.158.212" dyno=web.1 connect=0ms service=30000ms status=503 bytes=0 protocol=https在它写的地方上线

session.connect();

我尝试了很多东西，改变了超时值但没有。有人可以帮我看看我在哪里弄错了吗？

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