Comment 57 for bug 151544

I'm not sure what was the error. If it was etc/host or etc/hosts (I didn't pay enough attention to it. If I would have known that it was about to solve my problem, I would have taken the error more seriously).
Anyway, this is the content of "/etc/host.conf"

# The "order" line is only used by old versions of the C library.
order hosts,bind
multi on

Hope this helps to solve the problem.