After update networking fails with rootless Docker

yurj · November 28, 2025, 9:36am

They found the PR that generates the regression, and there are several workarounds here:

After update (29.0.x) networking fails with rootless Docker (`DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=slirp4netns`)

opened 05:28PM - 25 Nov 25 UTC

status/0-triage kind/bug area/networking area/rootless kind/regression area/networking/portmapping

### Description networking fails with rootless Docker e.g. docker run -it -p 30…00:3080 alpine ash Error response from daemon: failed to set up container networking: driver failed programming external connectivity on endpoint …… failed to bind host port 10.0.2.100:3000/tcp: address already in use It fails regardless which port is picked. (see also https://forums.docker.com/t/after-update-networking-fails-with-rootless-docker/150458) ### Reproduce docker run -it -p 3000:3080 alpine ash ### Expected behavior _No response_ ### docker version ```bash 29.0.4 ``` ### docker info ```bash Client: Docker Engine - Community Version: 29.0.4 Context: rootless Debug Mode: false Plugins: buildx: Docker Buildx (Docker Inc.) Version: v0.30.0 Path: /usr/libexec/docker/cli-plugins/docker-buildx compose: Docker Compose (Docker Inc.) Version: v2.40.3 Path: /usr/libexec/docker/cli-plugins/docker-compose ``` ### Additional Info _No response_ - - - **Below is added by @AkihiroSuda** # Workaround: use pasta Tested on Ubuntu 24.04, Docker 29.0.4. Similar to slirp4netns, the src IP information is preserved. ```bash sudo apt install -y passt mkdir -p ~/.config/systemd/user/docker.service.d/ cat <<EOF >~/.config/systemd/user/docker.service.d/override.conf [Service] Environment="DOCKERD_ROOTLESS_ROOTLESSKIT_NET=pasta" Environment="DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=implicit" EOF systemctl --user daemon-reload systemctl --user restart docker ``` # Another Workaround `-p 127.0.0.1:8080:80` and `-p 0.0.0.0:8080:80` seems to work while `-p 8080:80` fails.

yurj · November 28, 2025, 12:40pm

Here the fix: libnet/pm/nat: don't bind IPv6 ports if not supported by port driver by akerouanton · Pull Request #51616 · moby/moby · GitHub so the solution should be soon available.

galaxytrucker · December 3, 2025, 6:18am

It has been fixed in version 29.1.2 which is available now.

system · January 2, 2026, 6:18am

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After update networking fails with rootless Docker

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