Timeout while waiting for handshake or handshake errors

Hello,

I was working on a script to fetch some files from an sftp server through a SOCKS5 proxy and I noticed some strange behaviour. I managed to use a workaround to make it work, but I saw that people are experiencing this issue so it might be worth investigating more.

I was getting timeouts (Only when using the proxy though) when calling the sftp.connect(ssh_config) function. So I tried using the ssh2 library directly, and I was able to connect without any issue (through the proxy) My workaround was to connect the ssh2 client from outside the ssh2-sftp-client library and do the same calls as the ssh2-sftp-client library afterwards.

const SSHClient = require('ssh2').Client;
const sftpClient = require("ssh2-sftp-client");

const sftp = new sftpClient();

var ssh_config = {
    host: process.env.ssh_hostname,
    port: process.env.ssh_port,
    username: process.env.ssh_username,
    privateKey: process.env.ssh_key_secret,
    passphrase: process.env.ssh_key_passphrase,
    debug: (txt) => { console.log('[ssh]', txt) },
    sock: socket
};

function getSftpConnection() {
    return new Promise((resolve) => {
        var conn = new SSHClient();
        sftp.client = conn;
        conn.connect(ssh_config);
        conn.on('ready', function () {
            console.log('sftp connection ready !');
            resolve(conn);
        });
    });
}

await getSftpConnection();
await sftp.getSftpChannel();
await sftp.get(
    files_config.remote.inputFilePath,
    files_config.local.inputFilePath
); //Works !

The original solution that is failing is :

const sftpClient = require("ssh2-sftp-client");
const sftp = new sftpClient();

var ssh_config = {
    host: process.env.ssh_hostname,
    port: process.env.ssh_port,
    username: process.env.ssh_username,
    privateKey: process.env.ssh_key_secret,
    passphrase: process.env.ssh_key_passphrase,
    debug: (txt) => { console.log('[ssh]', txt) },
    sock: socket
};

await sftp.connect(ssh_config); //Fails !
await sftp.get(
    files_config.remote.inputFilePath,
    files_config.local.inputFilePath
);

I tried to find the cause but didn’t see anything obvious. Maybe it has something to do with one of the event listeners initialized by the library.