I have created a GCP compute engine instance with a static external ip address. Machine type: n1-standard-2 (2 vCPUs, 7.5 GB memory). OS is Linux/Debian.
My intention is to create a plain Node.js TCP server on the machine. The code is as follows:
var net = require('net');
var HOST = '0.0.0.0';
var PORT = 110;
net.createServer(function(sock) {
console.log('CONNECTED: ' + sock.remoteAddress +':'+ sock.remotePort);
sock.on('data', function(data) {
console.log('DATA ' + sock.remoteAddress + ': ' + data);
sock.write('You said "' + data + '"');
});
}).listen(PORT, HOST);
console.log('Server listening on ' + HOST +':'+ PORT);
The client is:
var net = require('net');
var HOST = '104.197.23.132';
var PORT = 110;
var client = new net.Socket();
client.connect(PORT, HOST, function() {
console.log('CONNECTED TO: ' + HOST + ':' + PORT);
client.write('I am Chuck Norris!');
});
client.on('data', function(data) {
console.log('DATA: ' + data);
client.destroy();
});
client.on('close', function() {
console.log('Connection closed');
});
My firewall rules are as follows:
PLEASE NOTE: I am listening on port 110, and the client is trying to connect to the static external ip address. Itt appears that I am enabling TCP traffic over 110 according to firewall rules. The error I see is
Error: connect ETIMEDOUT 104.197.23.132:110
When I ssh into the instance, and run tcp client, I connect successfully. So the final question is, why can't local tcp client (my computer) connect to compute instance? Is there something wrong with my firewall rules / source filters / IP forwarding?
