FYI: You cannot run socket on ports < 1024 with normal user permission. You need to have root access for it.
There are total 3 ways to solve the error:-
1. Give root access and run it (which is usual one)
2. Redirect to other port
sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3000
Then launch my Node.js on port 3000. Requests to port 80 will get mapped to port 3000.
You should also edit your /etc/rc.local file and add that line minus the sudo. That will add the redirect when the machine boots up. You don't need sudo in /etc/rc.local because the commands there are run as root when the system boots.
Reference Link
3. Give Normal user capability of using sockets as root
Objective:- We are not providing full root access and only giving socket_root permission to access it by normal user to run your server on any port.
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://localhost.
Unfortunately, unless you sign on as root, you’ll normally have to use a URL like http://localhost:3000 - notice the port number.
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.
Reference Link
General Info Reference link from apache
