SSH2 connection failed in production - Timed out while waiting for handshake

I have the following function in my service to connect to my server using ssh:

  async executeSSHCommand(command: string): Promise<string> {
    const conn = new Client();
    const host = this._configService.get('bbb.host', { infer: true });
    const privateKey = this._configService.get('bbb.privateKey', { infer: true });
    const passphrase = this._configService.get('bbb.passphrase', { infer: true })?.replace(/\\n/g, '\n');

    // console.log('Connecting with:', {
    //   host,
    //   user: 'root',
    //   hasKey: privateKey,
    //   passphrase: passphrase,
    // });

    return new Promise((resolve, reject) => {
      conn.once('ready', () => {
        conn.exec(command, (err, stream) => {
          if (err) return reject(err);

          let output = '';
          stream.on('data', (data) => (output += data.toString()));
          stream.on('close', (code) => {
            conn.end(); // kończymy połączenie dopiero po zakończeniu komendy
            if (code !== 0) return reject(`Command failed with code: ${code}`);
            resolve(output);
          });
        });
      });

      conn.on('error', (err) => reject(err));
      conn.connect({ host, port: 22, username: 'root', privateKey, passphrase });
    });
  }

Unfortunately, while it works fine in development, it does not work in production (digital ocean app) - I have an error:

Timed out while waiting for handshake

Any ideas how to fix that?

Start at the conn.connect entry point in the reported function and review the ssh2 connection and handshake behavior. Compare the host, port, key, passphrase, and network conditions between development and the DigitalOcean production environment. Done means identifying a reproducible cause for the production-only handshake timeout or confirming that it is external to ssh2.