Opening port 3000 on Oracle cloud compute instance

Content

I am trying to open port 3000 on Oracle cloud compute instance. I followed Nodejs tutorial step by step but still the port is not opened.

I created another instance and add a new security rule to allow all traffic on all port as below snapshot 

I am able to do a ssh on the machine and checked using port open tools and it identify that port 22 is open but port 3000 is closed. The firewall rule on host allows port 3000 as shown below

$ sudo firewall-cmd --list-all
public
  <span class="hljs-attr" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline; box-sizing: inherit; color: var(--highlight-attribute);">target</span>: <span class="hljs-keyword" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline; box-sizing: inherit; color: var(--highlight-keyword);">default</span>
  icmp-block-inversion: no
  <span class="hljs-attr" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline; box-sizing: inherit; color: var(--highlight-attribute);">interfaces</span>:
  sources:
  services: cockpit dhcpv6-client ssh
  <span class="hljs-attr" style="margin: 0px; padding: