Updated 26/11/2025
In version 9.1.1 of Proxmox, the problem appears to be resolved.
In this tutorial, I will explain how to resolve the following error on a Docker host running on Proxmox in LXC.
When starting your Docker containers, you encounter the following error:
Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: error during container init: open sysctl net.ipv4.ip_unprivileged_port_start file: reopen fd 8: permission denied: unknown
This error appeared with version 1.7.28-2 of the containerd.io package.
To resolve this issue, you need to downgrade to version: 1.7.28-1.
Start by displaying the list of available versions:
apt list -a containerd.io
Install the old version:
apt install containerd.io=1.7.28-1~ubuntu.24.04~nobleAdapt the command to your operating system
Once installed, block the version of the containerd.io package.
apt-mark hold containerd.ioYou can now restart your Docker containers.
This is a temporary solution, until the bug is fixed.
To follow the progress:
