I have followed and read the documentation instructions very carefully and have been able to deploy a Django app connected to a PostgreSQL database. The issue is that the deployment does result a success, and looking at the instance logs here is what is shown:
I also tried with Gunicorn and it seems to have the same result. And configured the networks to allow all and allow unauthenticated invocations. What can be the issue here?
Solution: in order to by-pass DNS configuration on browser, I changed my DNS settings on my IPv4 settings and used the following DNS servers:
Now, it works on Postman too in my local computer.