Bug: "the hostname specified is not valid" when using custom wireguard vpn.

[Kuinox]

Is this urgent?

No

Host OS

TrueNAS

CPU arch

x86_64

VPN service provider

Custom

What are you using to run the container

Kubernetes

What is the version of Gluetun

Running version v3.36.0 built on 2023-10-31T13:10:39.622Z (commit 1c43a1d)

What's the problem 🤔

It seems that there is no way to use an hostname when setting up a custom wireguard config, I'm forced to enter an IP.
The docs on custom wireguard config doesn't show a way to setup up an hostname endpoint either.

Share your logs (at least 10 lines)

2024-01-11 16:01:12.226081+01:00💰 Help me? https://www.paypal.me/qmcgaw https://github.com/sponsors/qdm12
2024-01-11 16:01:12.226445+01:002024-01-11T16:01:12+01:00 INFO [routing] default route found: interface eth0, gateway 172.16.0.1, assigned IP 172.16.1.3 and family v4
2024-01-11 16:01:12.226483+01:002024-01-11T16:01:12+01:00 INFO [routing] local ethernet link found: eth0
2024-01-11 16:01:12.226530+01:002024-01-11T16:01:12+01:00 INFO [routing] local ipnet found: 172.16.0.0/16
2024-01-11 16:01:12.226582+01:002024-01-11T16:01:12+01:00 INFO [routing] local ipnet found: fe80::/64
2024-01-11 16:01:22.308412+01:002024-01-11T16:01:22+01:00 INFO [firewall] enabling...
2024-01-11 16:01:22.436107+01:002024-01-11T16:01:22+01:00 INFO [firewall] enabled successfully
2024-01-11 16:01:22.689221+01:002024-01-11T16:01:22+01:00 INFO [storage] creating /gluetun/servers.json with 17689 hardcoded servers
2024-01-11 16:01:22.753753+01:002024-01-11T16:01:22+01:00 ERROR VPN settings: provider settings: server selection: for VPN service provider custom: the hostname specified is not valid: one or more values is set but there is no possible value available
2024-01-11 16:01:22.753815+01:002024-01-11T16:01:22+01:00 INFO Shutdown successful

### Share your configuration

```yml
Using truenas qbittorrent app with gluetun as addons, with the following env variables:  
VPN_SERVICE_PROVIDER=custom
VPN_TYPE=wireguard
SERVER_HOSTNAMES=engage.cloudflareclient.com
VPN_ENDPOINT_PORT=2408
WIREGUARD_PUBLIC_KEY=REDACTED
WIREGUARD_PRIVATE_KEY=REDACTED
WIREGUARD_ADDRESSES=172.16.0.2/32

[Canopus20]

I am also facing the same problem and can't use the hostname (like engage.cloudflareclient.com). The custom mode seems to only accept IP addresses and with WARP, it doesn't work.

[DarkVader-cell]

True, this is still an issue as of July 2024, the only option is to manually update the IP once in a while when it stops working or a little script that could probably update the docker compose in a scheduled manner.

[qdm12]

Duplicate of #788 - please subscribe to that one.

This is by design, see https://github.com/qdm12/gluetun-wiki/blob/main/faq/others.md#server-information I'm working on a solution with a 'very restricted networking' when the VPN is down, but... not there yet.

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