Hi all I have created an Ubuntu EC2 instance and have installed nodejs on it. Am running a simple node js script (which IS running and not throwing any errors:
var net = require('net');
var server = net.createServer(function (socket) {
socket.write("from server\r\n");
socket.pipe(socket);
});
server.listen(8000, "localhost");
console.log("TCP server listening on port 8000 at localhost.");
to test this, (am on windows) I am running a program called hercules to attempt a tcp connection, but it always comes back with tcp connection error: 10061
and the IP address can't be pinged either.
My ec2's IP address is 54.76.31.140. I have added an inbound tcp:8000 0.0.0.0 rule to my security group in the aws console and I have added hercules to my windows firewall and avg exceptions. I have also added an exception to my home dsl router and finally I have checked the ubuntu iptables there are no rules set.
Pls help, I can't seem to find whats wrong here.
If you tell the server to listen on "localhost," that's the only place it will listen -- "localhost" -- the loopback interface, 127.0.0.1, which is only accessible from... the local host.
Remove the 2nd argument to server.listen().
http://nodejs.org/api/net.html#net_server_listen_port_host_backlog_callback
If you want to be able to ping your instance, you have to allow ICMP in the security group.
Also, before you fix it, and after, run this, and note the difference in output:
$ netstat -a -n | grep 8000 | grep -i tcp
Related
I was requested to create a Web Server with an API in it to test firewall rule we are planning to implement soon. I am quite new with all this network stuff, so I'm a bit lost on it.
I need to call this API from another machine. The JsonServer is using my port 3000, when I request my API through Postman, using https://localhost:3000/posts, my JSON file is returned normally, however when I change the localhost, to my IP, my connection is being refused. I decided to install a WebServer, to test it and I could access the default Apache page from my others machines. I opened the port 3000 on my server, but I couldn't. The WebServer is working with my IP as well. It seems to be something with my port 3000, and I a not sure about how to fix that.
I executed the command:
sudo lsof -i -P -n | grep 3000
And this was my output
node 29472 user 22u IPv4 254348 0t0 TCP 127.0.0.1:3000 (LISTEN)
Any ideas how can I access my API from another machine?
I'm trying to run a nodejs app on my VPS but for somereason I get a ERR_CONNECTION_TIMED_OUT error.
Here is my code:
const http = require('http');
const server = http.createServer((req, res) => {
res.end();
});
server.on('clientError', (err, socket) => {
socket.end('HTTP/1.1 400 Bad Request\r\n\r\n');
});
server.listen(8000);
when i cd to my directory and do
node index.js
, it gives me no error, but going to the browser and doing: mysite.com:8000 gives me nothing. The connections times out
EDIT:
when i do curl: enomshop.tk:8000, I get some feedback. Its like i can access from the within the VPS but no access publicly
This is the way you should go about resolving such issues
Check if the process is running
Run ps aux | grep <process> to check if your process is running
Check if the port is being used
Run sudo netstat -plant | grep <port> to check if port is listening or not and is it your process
Check if the service is responding locally
Run telnet 127.0.0.1 <port> and make sure you get a response. If you don't get a response then there are few possible issues you can look into
The process is not started the server listening
The process is not using the correct port
There is a firewall that is blocking the port. There is this for firewall-cmd, and this for ufw
Check if the service is responding externally
You can do telnet <external ip> <port>, if it doesn't work then there few things you should check below
Make sure your server is binding to 0.0.0.0 or <private ip> and not 127.0.0.1
Make sure the VPS server you are hosting on, has your <port> enabled for communication. This is different for each service provider
If you follow these steps, it would solve most common network issues in such cases
I was facing the same issue. To resolve that, just open up / allow the port from network security group (VPS) or Firewall to worldwide access.
And check telnet mysite.com port, it worked for me. Kindly let me know if you still face any issue, I will try to help further.
You will need to open up the 8000 port on your VPS or redirect the traffic from any open port on VPS to 8000
I've trying to run my nodejs/expressjs application on my godaddy server, but any port I use times out. I've tried using the application on my local device and it works fine. I have a snippet of my connection below.
var app = express();
app.listen(8080, function() {
console.log("Listening on port " + 8080);
});
When I run the program through ssh, I get no errors
node index.js
Listening on port 8080
But when I go to the corresponding location in my browser, I get:
xxx took too long to respond.
ERR_CONNECTION_TIMED_OUT
I'm pretty sure it has to do with running on the godaddy server. If anyone has experience using this service with nodejs, is there a specific port I should be using, or is there any other setup I should do?
Do you have a VPS with GoDaddy right? So I assume you have also root access.
SSH into your GoDaddy server as root and check if the node.js app actually listens on that port:
netstat -tunlp | grep 8080
If you see any result there for the node.js app and that port then the port is open.
By default, there should be a firewall on your server which might block most of the ports and allows only the necessary incoming traffic.
You can check if there is any rule for that port by issuing the command bellow:
iptables -nvL | grep 8080
If any result is returned, then you have to add an iptables rule to allow access to that port. There are multiple methods to do that:
permit full access from your IP access to the server
permit your ip to access port 8080 on the godaddy server
permit outside world to access port 8080 on your server
You could read any iptables guy, it's pretty easy to add/edit/delete firewall rules. Most of the cPanel/WHM servers come with CSF Firewall (which is based on iptables and perl scripts).
In order to allow an ip address to your firewall (if you have CSF Firewall installed) you have to issue the following command:
csf -a ip-address
I hope that helps!
I'm having trouble accessing my website through HTTP with an EC2 instance. I've tried changing the security setting by allowing HTTP on port 80, but it still doesn't work. SSH however is working fine. What could be the issue?
This is embarrassing, but the reason I couldn't connect to my EC2 instance was because my node js app never actually started a server for me to listen on port 80.
Adding this simple snippet of code
var server = app.listen(8080, function () {
var host = server.address().address
var port = server.address().port
console.log('Example app listening, host, port)
})
Along with this shell command for redirecting fixed the issue.
iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to 8080
Could check ip-tables if it is blocking 80, check the security group if the TCP for PORT 80 is open to your IP address or ( 0.0.0.0/0 ).
Given that you are able to SSH but not http, check if you can replicate the same settings in the SG which has the config for SSH 22 - also kindly look if the web-server ( or process ) is up and running in PORT 80.
First, login that instance, and run the command to confirm http service is running.
telnet INSTANCE_public_DNS_name 80
Then run the same command for your remote machine to confirm if there are any firewall issues.
If there is problem to telnet, then click the instance name, and go to description --> Security groups --> view rules.
You should see the port opened. If not, create a new security group or edit exist security groups, and assign to that instance.
I have a VPS with node.js installed, I already uploaded a basic example to test it on the server, so I tried doing this:
I access by SSH, navigate to my project folder and run
node app.js
I get this message
Express server listening on port 8080
I thought i could see my app here
example.com:8080 or server.example:8080... but nothing. Then I tried with the info from os.networkInterfaces(); and os.host(); and still nothing happen
could you help me out? as you can see I am a total noob on node.js. What I'm doing wrong? or what should I do before running my app? Something related to DNS's? i have no idea
How do you ssh to your host? with ip or name? Is it something like:
ssh root#example.com
if so then at least you know your DNS is ok.
Once on the server do a
netstat -a
if you find *:8080 then your server is listening in the default ip. If you see something like 12.23.45.67:8080 then this number is the ip your server is listening.
ifconfig
will give you the servers ip. This should be the same as the ip of example.com. If not then maybe there is some router/firewall in front of your server and you have to configure that to allow port 8080 to reach your server.
if someone ever has the same problem this is how i solved on CentOS:
Open this file
/ Etc / csf / csf.conf
Add the required port
Allow incoming TCP ports
TCP_IN = "20,21,22,25,53,80,110,143,443,465,587,993,995,26"
Allow outgoing TCP ports
TCP_OUT = "20,21,22,25,37,43,53,80,110,113,443,587,873"
Restart
# # Csf-r