Why I can access my website at (ip address):port but not (domain name):port?

Question

I have an Amazon EC2 instance running with an elastic IP 12.34.56.78. I own a domain name example.com which I've set up to point to the EC2 instance. I'm running an Apache web server on my EC2 instance on port 80, and I can see the website when I visit both http:// 12.34.56.78 and http:// example.com.

I'm also running a node.js server on port 3000. I can see the nodejs page when I visit http:// 12.34.56.78:3000, but not when I visit http:// example.com:3000. My EC2 instance's security group allows TCP/UDP on port 80, 443, and 3000. Why can't I see my node.js page when I visit my site via its domain name? (I want to run one Apache server and one node.js server)

I think I'm having this problem because I'm using cloudflare to link http:// example.com with 12.34.56.78. But even when I try to connect with http:// direct.example.com:3000, I cannot see my node.js server. (the direct subdomain is supposed to go straight to 12.34.56.78 with no work done by cloudflare)

Any ideas?

Answer 1

you can't, because if you pass your domain through cloudflare by clicking cloud-image, your port will be only available like this :

For requests made via HTTP (all domains on CloudFlare):

80 8080 8880 2052 2082 2086 2095

For requests made via HTTPS (only domains subscribed to Pro, Business, or Enterprise):

443 2053 2083 2087 2096 8443

my solution is create one sub-domain that not pass through cloudflare for any instance like ssh, python etc.

https://support.cloudflare.com/hc/en-us/articles/200169156-Which-ports-will-CloudFlare-work-with-