SFTP issue from SAP BTP NodeJS

Question

I m trying to read files from SFTP location using the following class:

SFTPClient.js:

let Client = require('ssh2-sftp-client');
class SFTPClient {
    constructor() {
      this.client = new Client();
    }
  
    async connect(options) {
      console.log(`Connecting to ${options.host}:${options.port}`);
      try {
        await this.client.connect(options);
      } catch (err) {
        console.log('Failed to connect:', err);
      }
    }
async disconnect() {
  await this.client.end();
}

async listFiles(remoteDir, fileGlob, res) {
  console.log(`Listing ${remoteDir} ...`);
  let fileObjects;
  try {
    fileObjects = await this.client.list(remoteDir, fileGlob);
  } catch (err) {
    console.log('Listing failed:', err);
    res.write('Listing failed:'+ err);
  }
  return fileObjects;
}

Connection to public demo SFTP is initiated from the following code: Helper.js:

const SFTPClient =require('./SFTPClient');
async function connectToDemoSFTP(){
    const parsedURL = new URL("sftp://test.rebex.net:22");
    const port = parsedURL.port;
    const { host, username, password } = {"host":"test.rebex.net", "username":"demo", "password":"password"};
    //* Open the connection
    const client = new SFTPClient();
    await client.connect({ host, port, username, password });
    return client;
}
module.exports = {connectToDemoSFTP};

index.js:

const { connectToDemoSFTP } = require('./utils/Helper');

let app = new express();
console.log(`Env port is ${process.env.PORT}`);
let port = process.env.PORT || 3000;
app.listen(port);

app.get('/nodejsapi/get/files', async (req, res) => {
    {
        let client = await connectToDemoSFTP();
        client.listFiles("./pub/example", undefined, res);
....
}

When I ran this locally from vscode, I am able to connect to the SFTP using expressjs get call and it lists down the files from the SFTP server (from pub/example folder). It also works fine from trial BTP account as well. I did not do any extra config in my trial account to make it functioning though...

However, when I deploy and test this in a productive BTP account, the connection is not succeeding. It fails at line: let client = await connectToDemoSFTP();

I am wondering how it is working in my trial BTP account and what is wrong here w.r.to productive SAP BTP account!! Can someone please help..

I could see the following log in BTP for the nodejs application:

STDOUT [APP/PROC/WEB/0] Failed to connect: Error: connect: getConnection: Timed out while waiting for handshake [APP/PROC/WEB/0] at SftpClient.fmtError (/home/vcap/app/node_modules/ssh2-sftp-client/src/index.js:111:22)

STDOUT [APP/PROC/WEB/0] at SftpClient.connect (/home/vcap/app/node_modules/ssh2-sftp-client/src/index.js:249:37)

STDOUT [APP/PROC/WEB/0] at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

STDOUT [APP/PROC/WEB/0] at async SFTPClient.connect (/home/vcap/app/utils/SFTPClient.js:10:9)

STDOUT [APP/PROC/WEB/0] at async connectToDemoSFTP (/home/vcap/app/utils/Helper.js:8:5)

STDOUT [APP/PROC/WEB/0] at async /home/vcap/app/index.js:64:22 {

STDOUT [APP/PROC/WEB/0] code: 'ERR_GENERIC_CLIENT',

STDOUT [APP/PROC/WEB/0] custom: true

STDOUT [APP/PROC/WEB/0] }

STDOUT [APP/PROC/WEB/0] Listing ./pub/example ...

STDOUT [APP/PROC/WEB/0] Connecting to test.rebex.net:22

Regards,

Faddy..