Your forum may work, but has no security, anyone can login and delete/steal the database. You need to setup your redis so that it has a password, and that it restricts access to localhost.
@yariplus thank you so much.
My original description of my issue was posted here: https://community.nodebb.org/topic/7183/which-file-to-edit-when-getting-rid-of-the-4567-port-number/9
If you are interested to fix the issue for me, let me know so that I can give you the access to my DO.
I did everything except getting rid of the port number. It's frustrating when you seem to have followed all the guiding instructions available on DO (for nginx) and NodeBB.
@pichalite That is a good idea
Thanks @julian for the service!