I'm testing out an app (hopefully to run on heroku, but am having issues locally as well). It's giving me an EACCES error when it runs http.Server.listen() - but it only occurs on some ports.
So, locally I'm running:
joe#joebuntu:~$ node
> var h = require('http').createServer();
> h.listen(900);
Error: EACCES, Permission denied
at Server._doListen (net.js:1062:5)
at net.js:1033:14
at Object.lookup (dns.js:132:45)
at Server.listen (net.js:1027:20)
at [object Context]:1:3
at Interface.<anonymous> (repl.js:150:22)
at Interface.emit (events.js:42:17)
at Interface._onLine (readline.js:132:10)
at Interface._line (readline.js:387:8)
at Interface._ttyWrite (readline.js:564:14)
I don't have anything running on port 900 (or any of the other 20 ports I've tried), so this should work. The weird part is that it does work on some ports. For instance, port 3000 works perfectly.
What would cause this?
Update 1:
I figured out that on my local computer, the EACCES error is coming because I have to run node as root in order to bind to those certain ports. I don't know why this happens, but using sudo fixes it. However, this doesn't explain how I would fix it on Heroku. There is no way to run as root on Heroku, so how can I listen on port 80?
Running on your workstation
As a general rule, processes running without root privileges cannot bind to ports below 1024.
So try a higher port, or run with elevated privileges via sudo. You can downgrade privileges after you have bound to the low port using process.setgid and process.setuid.
Running on heroku
When running your apps on heroku you have to use the port as specified in the PORT environment variable.
See http://devcenter.heroku.com/articles/node-js
const server = require('http').createServer();
const port = process.env.PORT || 3000;
server.listen(port, () => console.log(`Listening on ${port}`));
#Windows
Another one reason - maybe your port has been excluded by some reasons.
So, try open CMD (command line) under admin rights and run :
net stop winnat
net start winnat
In my case it was enough.
Solution found here : https://medium.com/#Bartleby/ports-are-not-available-listen-tcp-0-0-0-0-3000-165892441b9d
Non-privileged user (not root) can't open a listening socket on ports below 1024.
Check this reference link:
Give Safe User Permission To Use Port 80
Remember, we do NOT want to run your applications as the root user,
but there is a hitch: your safe user does not have permission to use
the default HTTP port (80). You goal is to be able to publish a
website that visitors can use by navigating to an easy to use URL like
http://ip:port/
Unfortunately, unless you sign on as root, you’ll normally have to use
a URL like http://ip:port - where port number > 1024.
A lot of people get stuck here, but the solution is easy. There a few
options but this is the one I like. Type the following commands:
sudo apt-get install libcap2-bin
sudo setcap cap_net_bind_service=+ep `readlink -f \`which node\``
Now, when you tell a Node application that you want it to run on port
80, it will not complain.
On Windows System, restarting the service "Host Network Service", resolved the issue.
If you are using Windows. You should try restarting Windows NAT Driver service.
Open Command Prompt as Administrator and run
net stop winnat
then
net start winnat
That's it.
It's happening because I installed Nord VPN and it was auto staring with windows.
Another approach is to make port redirection:
sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 900 -j REDIRECT --to-port 3000
And run your server on >1024 port:
require('http').createServer().listen(3000);
ps the same could be done for https(443) port by the way.
Spoiler alert: This answer may seems little funny.
I have spent more than 10 minutes to find out the root cause for this error in my system. I used this : PORT=2000; in my .env file.
Hope you already find it out. I had used a semicolon after declaring PORT number :'( I removed the extra sign and it started working.
I know this may not be answer for this question but hope it helps others who have faced same problem.
OMG!! In my case I was doing ....listen(ip, port) instead of ...listen(port, ip) and that was throwing up the error msg: Error: listen EACCES localhost
I was using port numbers >= 3000 and even tried with admin access. Nothing worked out. Then with a closer relook, I noticed the issue. Changed it to ...listen(port, ip) and everything started working fine!!
Just calling this out in case if its useful to someone else...
I had a similar problem that it was denying to run on port 8080, but also any other.
Turns out, it was because the env.local file it read contained comments after the variable names like:
PORT=8080 # The port the server runs at
And it interpreted it like that, trying to use port "8080 # The port the server runs at", which is obviously an invalid port (-1).
Removing the comments entirely solved it.
Using Windows 10 and Git Bash by the way.
I know it's not exactly the problem described here, but it might help someone out there. I landed on this question searching for the problem for my answer, so... maybe?
It means node is not able to listen on defined port. Change it to something like 1234 or 2000 or 3000 and restart your server.
restart was not enough! The only way to solve the problem is by the following:
You have to kill the service which run at that port.
at cmd, run as admin, then type :
netstat -aon | find /i "listening"
Then, you will get a list with the active service, search for the port that is running at 4200n and use the process id which is the last column to kill it by
: taskkill /F /PID 2652
I got this error on my mac because it ran the apache server by default using the same port as the one used by the node server which in my case was the port 80. All I had to do is stop it with sudo apachectl stop
Hope this helps someone.
Remember if you use sudo to bind to port 80 and are using the env variables PORT & NODE_ENV you must reexport those vars as you are now under root profile and not your user profile. So, to get this to work on my Mac i did the following:
sudo su
export NODE_ENV=production
export PORT=80
docpad run
I got this error on my mac too. I use npm run dev to run my Nodejs app in Windows and it works fine. But I got this error on my mac - error given was: Error: bind EACCES null:80.
One way to solve this is to run it with root access. You may use sudo npm run dev and will need you to put in your password.
It is generally preferable to serve your application on a non privileged port, such as 3000, which will work without root permissions.
reference: Node.js EACCES error when listening on http 80 port (permission denied)
this happens if the port you are trying to locally host on is portfowarded
Try authbind:
http://manpages.ubuntu.com/manpages/hardy/man1/authbind.1.html
After installing, you can add a file with the name of the port number you want to use in the following folder: /etc/authbind/byport/
Give it 500 permissions using chmod and change the ownership to the user you want to run the program under.
After that, do "authbind node ..." as that user in your project.
My error is resolved using (On Windows)
app.set('PORT', 4000 || process.env.PORT);
app.listen(app.get('PORT'), <IP4 address> , () => {
console.log("Server is running at " + app.get('PORT'));
});
Allow the NodeJS app to access the network in Windows Firewall.
My error got resolved just by changing port number in server.js
Specially in this line
const port = process.env.PORT || 8085;
I changed my port number to 8085 from 8080.
Hope it helps.
For me this issue affected all hosts and all ports on Windows in PowerShell.
Disabling Network Interfaces fixed the issue.
I had WiFi and an Ethernet connection and disabling the Ethernet Interface fixed this issue.
Open "Network Connections" to view your interfaces. Right-click and select "Disable".
This means the port is used somewhere else. so, you need to try another one or stop using the old port.
I tried every answer given above, but nothing works out, then I figured out that I forget to add const before declaring the variable in the .env file.
Before:
PORT = 5000;
HOST = "127.0.0.1";
After:
const PORT = 5000;
const HOST = "127.0.0.1";
So the possible reason for this would be related to typo in environment variables names or else not installed dotenv package .
So if there is any other error apart from typo and dotenv npm package ,then you must try these solutions which are given below:
First solution
for Windows only
Open cmd as run as administrator and then write two commands
net stop winnat
net start winnat
hope this may solve the problem ...
Second solution
for windows only
make sure to see that in your environment variable that there is no semicolon(;) at the end of the variable and there is no colon (:) after the variable name.
for example I was working on my project in which my env variables were not working so the structure for my .env file was like PORT:5000; CONNECTION_URL:MongoDbString.<password>/<dbname>; so it was giving me this error
Error: listen EACCES: permission denied 5000;
at Server.setupListenHandle [as _listen2] (node:net:1313:21)
at listenInCluster (node:net:1378:12)
at Server.listen (node:net:1476:5)
at Function.listen (E:\MERN REACT\mern_memories\server\node_modules\express\lib\application.js:618:24)
at file:///E:/MERN%20REACT/mern_memories/server/index.js:29:9
at processTicksAndRejections (node:internal/process/task_queues:96:5)
Emitted 'error' event on Server instance at:
at emitErrorNT (node:net:1357:8)
at processTicksAndRejections (node:internal/process/task_queues:83:21) {
code: 'EACCES',
errno: -4092,
syscall: 'listen',
address: '5000;',
port: -1
}
[nodemon] app crashed - waiting for file changes before starting...
So i did some changes in my env file this time i removed the colon(:) and replaced it with equal(=) and removed semi colon at the end so my .env file was looking like this
PORT = 5000
CONNECTION_URL = MongoDbString.<password>/<dbname>
After changing these thing my server was running on the port 5000 without any warning and issues
Hope this may works...
#code #developers #mernstack #nodejs #react #windows #hostservicenetwork #http #permission-denied #EACCES:-4092
After trying many different ways, re-installing IIS on my windows solved the problem.
The same issue happened to me.
You need to check out your server.js file where you are setting your listening port. Change port number wisely in all places, and it will solve your issue hopefully.
For me, it was just an error in the .env file. I deleted the comma at the end of each line and it was solved.
Before:
HOST=127.0.0.1,
After:
HOST=127.0.0.1
Error: listen EACCES: permission denied 3000;
i add "PORT = 3000;" while "PORT = 3000" .
just semicolon";" give error
remove semicolon and project run successfully
I had a similar problem that it was denying to run on port 5000,
Turns out, it was because the env.local file contained comma(';') after variable names like:
PORT= 5000;
And it interpreted it like that, trying to use port "5000;", which is obviously an invalid port (-1). Removing the ';' entirely solved it.
I know it's not exactly the problem described here, but it might help someone out there. I landed on this question searching for the problem for my answer, so... maybe?
This worked perfectly fine for me, set your port at the bottom of the page with this code instead
let port = process.env.PORT;
if (port == null || port == "") {
port = 3000;
}
app.listen(port, function() {
console.log('app started successfully')
});
Some times it is because of bad configuration the dot.env like: require("dotenv").config without () in your app middle ware or may be you write your port number with wrong syntax like instead of = you write : or add some other symbols in port number.
I've been given a project that is using a Paho/MQTT client through Javascript to update a web page. The project starts an http server through python on localhost:8080 and then, when the webpage is loaded, a main.js script starts the client and runs the connect as shown below:
var client = new Paho.MQTT.Client("localhost",Number(8080),'0');
client.onConnectionLost = onConLost;
client.onMessageArrived = onMesArvd;
console.log("start connection...");
client.connect({onSuccess: onConnect});
The problem is that upon trying to connect the below error appears and the onConnect method does not appear to connect as a console.log does not appear:
WebSocket connection to 'ws://localhost:8080/mqtt' failed: Error during WebSocket handshake: Unexpected response code: 404
The code highlighted in red in the paho-mqtt.js is below:
new WebSocket(a, ["mqtt"])
I tried adding a mqtt file to the folder localhost is being run from but it only changes the response code (301 if a mqtt folder is present, 200 if a file).
Adding the mosquitto.conf that came with the project:
pid_file /var/run/mosquitto.pid
persistence true
persistence_location /var/lib/mosquitto/
log_dest file /var/log/mosquitto/mosquitto.log
include_dir /etc/mosquitto/conf.d
listener 1883
listener 8080
protocol websockets
I noticed it's not in the same folder as the paho/mqtt client but in ../dir2/setup/.
I've looked around but I haven't seen anyone with this issue so any help/guidance would be greatly appreciated. Thanks!
Thanks to Santosh Balaji for pointing me in the right direction on this one.
I believe I needed to install mosquitto on the pi and then change the mosquitto.conf file in the mosquitto install dir to the one provided by the project. After installing and confirming my conf was being used the js and Python connected without issue.
1) Is port 8080 occupied by other process before starting mqtt. Try to start your mosquitto with conf file. It will show up error if there is anything wrong with the start.
mosquitto -c mosquitto.conf
2) Try changing the port to 9001 as it is default port for using websockets in mqtt
I am new to sails.js and trying to develop a simple app on a remote sandbox server. When I do 'sails lift' to test running the app, I cannot access it by 'localhost'.
I am wondering what's the right way of running sails on a specific IP during development. I tried 'sails lift --ip xxx.xxx.xx.xx', but it does not work, and the documentation on this seems lacking.
Does anyone know how to run sails.js on an IP without needing deployment?
You need to use local.js in config directoty to add this config:
{
host: your_ip,
port: your_port
}
Or add port and host in config/env/development.js
For anyone looking for Sails 1.x, as host is deprecated in new version, so new name for specifying host is, "explicitHost".
So one can mention in config/env/development.js
explicitHost: 'your_ip_Address'
port: 'your_port_number'
For more, sails documentation for these kind of settings
I locally wrote a nodeJS app using socket.io and express modules.
I wanted to use openshift for hosting.
So I changed the main .js to server.js which seems to be the index equivalent of the openshift file and changed the server port setting to:
var server = require('http').createServer(app).listen(process.env.OPENSHIFT_NODEJS_PORT || 3000);
as indicated in some posts.
However after git commit, I am still getting:
remote: info: socket.io started
remote: warn: error raised: Error: listen EACCES
remote: DEBUG: Program node server.js exited with code 0
remote:
remote: DEBUG: Starting child process with 'node server.js'
and the website doesn't work.
As the app is serving a html file, there are two more places, where the port is mentioned, which sit in the index.html that is served:
header:
<script src='//localhost:3000/socket.io/socket.io.js'></script>
and within javascript for the html file:
var socket = io.connect('//localhost:'+process.env.OPENSHIFT_NODEJS_PORT || 3000);
// intial vars and multi list from server
socket.on('clientConfig', onClientConfig);
All files and modules are seemingly uploaded, but the EACCES error still prevails.
I get the feeling that maybe the header link to localhost:3000 might be the skipping point, but I am not sure. Anyone have any idea, what the problem is?
Also, there is no : socket.io/socket.io.js file in the socket.io modules folder, which I find confusing.
I had recently developed a chat client application using socket.io and also had webrtc in it. I was able to deploy the app on openshift by making the following changes into code.
Client Side
Keep the include script tag in a relative manner like so
<script src="/socket.io/socket.io.js"></script>
While declaring io.connection, change the ip part to point the application to server in this format.
var socket = io.connect('http://yourapp-domain.rhcloud.com:8000/', {'forceNew':true });
8000 is for http and 8443 is for https
Server Side
The io and the server should both be listening on the same port and the order in which the statements are run should also be given attention.
Step 1: Declare the http server using app.
( app is obtained from express)
var express = require('express');var app = express();)
var server = require('http').Server(app);
Step 2:
Declare io from socket.io and combine it with the server object.
var io = require('socket.io').listen(server);
Step 3:
Now, allow the server to listen to openshift port and ip.
server.listen(process.env.OPENSHIFT_NODEJS_PORT, process.env.OPENSHIFT_NODEJS_IP);
Please pay special attention to the order of the statements you write, it is the order which causes issues.
The server side of your websocket needs to listen on port 8080 on your openshift ip address, the CLIENT side needs to connect to your ws://app-domain.rhcloud.com:8000
I have a few notes on how to use WebSockets here: https://www.openshift.com/blogs/10-reasons-openshift-is-the-best-place-to-host-your-nodejs-app#websockets
You don't need any additional server-side changes after adapting your code to take advantage of environment variables (when available)
OpenShift's routing layer exposes your application on several externally-accessible ports: 80, 443, 8000, 8443.
Ports 8000 and 8443 are both capable of handling websocket connection upgrades. We're hoping to add support for WebSocket connections over ports 80 and 443 soon.