If you’re not sure how to get to that point, check out this tutorial.įrom your EC2 console, click Load Balancers in the side menu then click the Create Load Balancers button. I’m going to assume you have an EC2 instance running with a webserver listening on port 3000. But even if we only have one EC2 instance, load balancers are still a handy way to just forward ports. If you’re interested in finding out more about what they can do, check out the Application Load Balancer page. Now, go to the Advanced Settings option showing on the left side and click on it. There you need to click on the Windows Firewall. ![]() First, you need to browse the Control Panel and search for System and Security showing on the box’s left side. AWS Load Balancers can also do a bunch of other clever things, such as making sure that connections from Asia get sent to EC2 instances based in Singapore. Below we have explained the process to enable Port 80 and 443 on Windows. If youre binding on :PORT, you do not need to also bind on a specific IP. Apache binds to :80, and then tries to also bind on 1.2.3.4:80, which fails because it is already bound by the first line. It distributes the traffic evenly among instances so one instance doesn’t get overloaded. A configuration like this: Listen :80 Listen 1.2.3.4:80 will incur the same error message. Usually, a load balancer sits in front of multiple EC2 instances and manages traffic coming in. By creating an AWS Load Balancer, you can let the load balancer listen on port 80 or 443 and have it route traffic to another port on your EC2 instance. However, if you are running your server on an EC2 instance on AWS, you can more easily solve this problem without having to deal with complex iptables. If you want to look into using iptables here are a few resources. Alternatively, you can use an iptables prerouting command to forward all incoming requests on port 80 to the port you’re running your server on. You can run an iptables command to open ports 80. One way to solve this problem is by using iptables - the linux firewall. By default SELinux only allows port number 80 and 443 for httpd service. Restart httpd: /etc/init.d/httpd restart A note about SELinux If you are using SELinux, make sure port 81 is configured and not blocked by SELinux. If you try to run code which attempts to bind to port 80 for example, you may receive an error like Error: listen EACCES 0.0.0.0:80. Listen 81 Force httpd to listen on both port 80 and 81: Listen 80 Listen 81 Save and close the file. That’s a problem if you want to serve a website over HTTP or HTTPS which have default ports of 80 and 443. Linux servers limit non-root processes from binding to ports less than 1024. ![]() How to serve your website on port 80 or 443 using AWS Load Balancers
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