Bug: host is not an IP address in custom configuration

[stauffenberg2020]

Is this urgent?

Yes

Host OS

Synology NAS

CPU arch

x86_64

VPN service provider

Custom

What are you using to run the container

Portainer

What is the version of Gluetun

3.40

What's the problem 🤔

I get the following error when trying to run in custom configuration.

2025-04-07T08:32:24Z ERROR VPN settings: OpenVPN settings: custom configuration file: extracting information from custom configuration file: extracting connection from file: on line 6: extracting from remote line: host is not an IP address: india-uk-ca-version-2.expressnetw.com

Share your logs (at least 10 lines)

Running version v3.40.0 built on 2024-12-25T22:01:25.675Z (commit e890c50)

🔧 Need help? ☕ Discussion? https://github.com/qdm12/gluetun/discussions/new/choose

🐛 Bug? ✨ New feature? https://github.com/qdm12/gluetun/issues/new/choose

💻 Email? quentin.mcgaw@gmail.com

💰 Help me? https://www.paypal.me/qmcgaw https://github.com/sponsors/qdm12

2025-04-07T08:32:23Z INFO [routing] default route found: interface eth0, gateway 172.18.0.1, assigned IP 172.18.0.2 and family v4

2025-04-07T08:32:23Z INFO [routing] local ethernet link found: eth0

2025-04-07T08:32:23Z INFO [routing] local ipnet found: 172.18.0.0/16

2025-04-07T08:32:23Z INFO [firewall] enabling...

2025-04-07T08:32:23Z INFO [firewall] enabled successfully

2025-04-07T08:32:24Z INFO [storage] creating /gluetun/servers.json with 20776 hardcoded servers

2025-04-07T08:32:24Z ERROR VPN settings: OpenVPN settings: custom configuration file: extracting information from custom configuration file: extracting connection from file: on line 6: extracting from remote line: host is not an IP address: india-uk-ca-version-2.expressnetw.com

2025-04-07T08:32:24Z INFO Shutdown successful

Share your configuration

services:
  gluetun:
    image: qmcgaw/gluetun:v3.40 #v3.39.1
    container_name: vpn
    cap_add:
      - NET_ADMIN
    volumes:
      - /volume1/docker/gluetun/my_expressvpn_india_via_uk_udp.ovpn:/gluetun/custom.conf:ro
    environment:
      - VPN_SERVICE_PROVIDER=custom
      - VPN_TYPE=openvpn
      - OPENVPN_CUSTOM_CONFIG=/gluetun/custom.conf
      - OPENVPN_USER=xyz
      - OPENVPN_PASSWORD=xyz
    ports:
      - 8183:8183 # for qBittorrent webUI
    #restart: unless-stopped

[github-actions]

@qdm12 is more or less the only maintainer of this project and works on it in his free time.
Please:

• do not ask for updates, be patient
• 👍 the issue to show your support instead of commenting
  @qdm12 usually checks issues at least once a week, if this is a new urgent bug,
  revert to an older tagged container image

[stauffenberg2020]

I have to use custom configuration due to the unresolved issue highlighted in #2492