Using port 8008 for HTTP service on Oracle Linux

Summary:

I have a Compute instance running Oracle Linux 8.6 server. I use it to run nginx proxying to a couple of web apps on the backend. I have port 80 working. But trying to use 8008 has failed.

Content (required):

I have set up ingress rules for port 80 and 8008 in the Default Security List. I have also enabled the ports in firewalld.

I have had HTTP on port 80 working for a while. However, port 8008 refuses connection, except on [::]1. All connection to the host's IPv4 address refuse connection. Port scanning using nmap shows that port 22 and 80 open, 8008 closed.

From all I can gather, it seems that the nginx is not listening on port 8008 at the host's local address that is "localhost".