Can't access WHM Terminal from unprivileged LXC container

Symptoms

On a server running in an unprivileged LXC container, you get an error message like this when you try to connect to the terminal in WHM:

Error: The connection to the server ended in failure at 1:31:10 PM. (ABORTED)

Description

You cannot connect to the WHM Terminal because the /proc filesystem has the ownership of the non-privileged nobody user, instead of the privileged root user:

[00:34:18 root@server ~]cPs# ls -ld /proc
dr-xr-xr-x 847 65534 65534 0 Dec 24 00:00 /proc

Workaround

Run the server in a privileged container.

Note: cPanel & WHM is designed to run with unrestricted access to the operating system, and unprivileged containers often have limitations that can cause behavior differences. You can read more about unprivileged-container limitations here:

Privileged vs unprivileged containers