PSA: For fresh installs (12.11.2025) - downgrade Docker - Traefik API outdated

[danielslyman]

Docker 29.0 enforces a minimum Engine API version of 1.44. Any client that still uses version 1.24 (like Traefik, apparently) receives this unexpected error.

Downgrading to version 28.x restores the previous behavior. To downgrade on Ubuntu 24.04.3 LTS, you can e.g. run the following command:

apt-get install --yes --allow-downgrades \ docker-ce="5:28.5.2-1~ubuntu.24.04~noble" \ docker-ce-cli="5:28.5.2-1~ubuntu.24.04~noble" \ docker-ce-rootless-extras="5:28.5.2-1~ubuntu.24.04~noble" \ containerd.io \ docker-buildx-plugin \ docker-compose-plugin

lead to no cert being issue and 404 errors.

Hope this helps.

[micbar]

Thanks. Upstream issue is traefik/traefik#12253

[caracola487]

It is also possible to use the latest docker version. Therefore you have to create
/etc/systemd/system/docker.service.d/min_api_version.conf
enter here

[Service]
Environment="DOCKER_MIN_API_VERSION=1.24"

Restart the service and it should run. This worked for me.

Original post

[streaminganger]

v3.6.1 of traefik was released which should have resolved the issue. don't forget to docker compose pull before restarting the stack for those still having problems