NethCTI Server: binds to IPv6 only when /etc/hosts has localhost mapped to ::1

[edospadoni]

Description

On some NethServer 8 machines, the set-fqdn script comments out the IPv4 localhost entry in /etc/hosts, leaving only the IPv6 mapping:

# commented by set-fqdn #127.0.0.1   nethvoice localhost localhost.localdomain ...
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

This causes localhost to resolve only to ::1 (IPv6 loopback).

The nethcti-server HTTP proxy server and all internal REST services bind to localhost, which means they listen only on ::1. Any IPv4 connection (e.g. curl http://127.0.0.1:20050/...) gets connection refused.

$ netstat -tulnp | grep 20050
tcp6       0      0 ::1:20050               :::*                    LISTEN      239877/node

Additionally, the internal proxy router URLs use http://127.0.0.1:PORT, so even internal proxying between the gateway and backend services can fail.

Fix

• nethcti-server: change the default bind address from localhost to 127.0.0.1 in http_proxy.js, and make it configurable via services.json
• ns8-nethvoice: change all "address": "localhost" to "address": "127.0.0.1" in the services.json template in entrypoint.sh

This ensures all services explicitly bind to IPv4 127.0.0.1, consistent with the router URLs that already use 127.0.0.1.

Thread reference: https://mattermost.nethesis.it/nethesis/pl/58oe18kfttgm9kixnrf63oog6w