FetchError reason: connect ETIMEDOUT / ⚠ Failure: An unexpected error was thrown:

What happened?

Context:

I have two Pi-Hole:

main: 192.168.1.15
backup: 192.168.1.13

both of them use a self-signed certificate with an HTTP to HTTPS redirection on lighttpd/1.4.69.

I'm using docker on the main Pi-Hole (192.168.1.15) with the following configuration (password redacted):

version: '3'
services:
  orbital-sync:
    image: mattwebbio/orbital-sync:1
    environment:
      PRIMARY_HOST_BASE_URL: 'https://192.168.1.15'
      PRIMARY_HOST_PASSWORD: '<password_main_pihole>'
      SECONDARY_HOSTS_1_BASE_URL: 'https://192.168.1.13'
      SECONDARY_HOSTS_1_PASSWORD: '<password_backup_pihole>'
      INTERVAL_MINUTES: 60

I have access to both Pi-Hole from another computer and I can curl from the main backup to its own admin page locally (when ignoring that the cert is selfsigned): curl -I --insecure https://192.168.1.13:443/admin :

dietpi@rasp-green:~/orbital-sync$ curl -I --insecure https://192.168.1.13:443/admin
HTTP/2 301 
location: /admin/
date: Mon, 09 Sep 2024 18:38:20 GMT
server: lighttpd/1.4.69

Orbital-sync try to connect from the main Pi to its own admin page and fail after a while with "⚠ Failure: An unexpected error was thrown:"

Version

V1.8.2

Log output

dietpi@rasp-green:~/orbital-sync$ docker compose up
WARN[0000] /home/dietpi/orbital-sync/docker-compose.yml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion 
[+] Running 1/0
 ✔ Container orbital-sync-orbital-sync-1  Created                                                                                                                                        0.0s 
Attaching to orbital-sync-1
orbital-sync-1  | 9/9/2024, 6:26:23 PM: ➡️ Signing in to https://192.168.1.15/admin...
orbital-sync-1  | 9/9/2024, 6:28:33 PM: ⚠ Failure: An unexpected error was thrown:
orbital-sync-1  | - FetchError: request to https://192.168.1.15/admin/index.php?login failed, reason: connect ETIMEDOUT 192.168.1.15:443
orbital-sync-1  | 9/9/2024, 6:28:33 PM: Waiting 60 minutes...

mattwebbio / orbital-sync