Hello everyone,
I figured if a linux machine is using IPv6 as localhost address resolution (::1), then the startup process get stuck trying to reach ::1: instead of 127.0.0.1: being used by the backend process.
It can be solved by changing the entry in /etc/hosts :
from
::1 localhost.localdomain localhost
to
127.0.0.1 localhost.localdomain localhost
An issue has been filled here. This post stands a documentation for users while this is fixed.