problem with docker-compose after wildcard domain configuration

[lantura]

I have configured wildcard domains acc. pangolin documentation.
If I start "docker compose up" after modifying all yml-files the screen stopped with:

At first, I thought the wait was due to the DNS challenge, but it's taking too long.

I have changed the yml-files as follows (The indentation of the lines in the YML files is correct, but it does not appear to be reproduced here.):

config.yml:
domains:
domain1:
base_domain: "mydomain.eu"
cert_resolver: "letsencrypt"
prefer_wildcard_cert: true

traefik_config.yml:
certificatesResolvers:
letsencrypt:
acme:
dnsChallenge:
provider: "ionos"
email: "[email protected]"
storage: "/letsencrypt/acme.json"
caServer: "https://acme-v02.api.letsencrypt.org/directory"

dynamic_config.yml:
next-router:
rule: "Host(pangolin.mydomain.tld) && !PathPrefix(/api/v1)"
service: next-service
entryPoints:
- websecure
tls:
certResolver: letsencrypt
domains:
- main: "mydomain.eu"
sans:
- "*.mydomain.eu"

docker-compose.yml:
traefik:
image: docker.io/traefik:v3.5
container_name: traefik
restart: unless-stopped

network_mode: service:gerbil # Ports appear on the gerbil service

depends_on:
pangolin:
condition: service_healthy
command:
- --configFile=/etc/traefik/traefik_config.yml

Add the environment variables for your DNS provider.

environment:
IONOS_API_KEY:
volumes:
- ./config/traefik:/etc/traefik:ro # Volume to store the Traefik configuration
- ./config/letsencrypt:/letsencrypt # Volume to store the Let's Encrypt certificates
- ./config/traefik/logs:/var/log/traefik # Volume to store Traefik logs
# Shared volume for certificates and dynamic config in file mode
- pangolin-data:/var/certificates:ro
- pangolin-data:/var/dynamic:ro

Any hints what's going wrong?

[lantura]

If I stop with "Ctrl-C" the following results:

traefik | 2025-10-12T14:36:25Z INF Testing certificate renew... acmeCA=https://acme-v02.api.letsencrypt.org/directory providerName=letsencrypt.acme

Gracefully Stopping... press Ctrl+C again to force
Container traefik Stopping
traefik | 2025-10-12T14:41:52Z INF I have to go...
traefik | 2025-10-12T14:41:52Z INF Stopping server gracefully
traefik | 2025-10-12T14:41:53Z INF Server stopped
traefik | 2025-10-12T14:41:53Z INF Shutting down
Container traefik Stopped
Container gerbil Stopping

Between all of the following messages this row will be displayed very often:
gerbil | ERROR: 2025/10/12 14:41:53 Error reading UDP packet: read udp [::]:21820: use of closed network connection

gerbil | INFO: 2025/10/12 14:41:53 Shutting down servers...
Container gerbil Stopped
Container pangolin Stopping
gerbil exited with code 0
pangolin | 2025-10-12T14:41:53.958Z [info]: WebSocket cleanup completed
traefik exited with code 0
gerbil exited with code 0
Container gerbil Stopped
Container pangolin Stopping
pangolin | 2025-10-12T19:33:27.463Z [info]: WebSocket cleanup completed
Container pangolin Stopped
pangolin exited with code 137

Does anybody have an idea why docker compose will not finish?
If DNS challenge fails then these should be displayed with an error code.

[lantura]

I'm one step further: After deleting the acme.json file from the LE directory, docker-compose continues to run, but now gets stuck at this step:

However, new certificates are retrieved and stored in a new acme.json file.
Can anyone help here?

[gomeology]

This happened to me as well I had to scrap the config folder and use the installer to rebuild it. I would wait 10 min and didn't see a DNS entry in cloudflare for the request.

I also went between token and API it was no different.