Can't bind to localhost:80 (webserver or any other service listening on this port).

[christophorus]

const { Client } = require('ssh2');

const conn = new Client();
conn.on('ready', () => {
    console.log('Client :: ready');
    conn.forwardIn('127.0.0.1', 80, (err) => {
        if (err) throw err;
        console.log('Listening for connections on server on port 8000!');
    });
}).on('tcp connection', (info, accept, reject) => {
    console.log('TCP :: INCOMING CONNECTION:');
    console.dir(info);
    accept().on('close', () => {
        console.log('TCP :: CLOSED');
    }).on('data', (data) => {
        console.log('TCP :: DATA: ' + data);
    }).end([
        'HTTP/1.1 404 Not Found',
        'Date: Thu, 15 Nov 2012 02:07:58 GMT',
        'Server: ForwardedConnection',
        'Content-Length: 0',
        'Connection: close',
        '',
        ''
    ].join('\r\n'));
}).connect(connectConfig);

When service is listening on the port for example 8080 all is fine( conn.forwardIn('127.0.0.1', 8080, (err) => {}

Below fix the problem, but all makes work around. I will appreciate any hint.

net.createServer(function (from) {
        var to = net.createConnection({
            host: host,
            port: 80
        });
        from.pipe(to);
        to.pipe(from);
    }).listen(8080, 80);

[mscdex]

ssh2 doesn't bind any local ports or automatically forward connections for you (e.g. like with OpenSSH's -L and -R forwarding), that is up to you to do. The reason for this is that it gives you the opportunity to handle connections in-process.