On Thu, 4 May 2023 at 19:07, zithro <[email protected]> wrote: > this is a rather strange problem, I hope the title is explicit enough.
Subject: Logging off an X session closes all ssh -X connections started previously from outside X > Here is what happens chronologically : > > 1. I start various SSH connections to a host, some normal, some with X > forwarding, like that: "ssh user@host" and "ssh -X -n user@host GUI_APP" > (like firejail firefox, firejail thunderbird, etc). There's no user > connected under X yet, only the greeter is displayed. > > 2. using VNC or rdesktop, I then log on to X on the machine, do some > stuff, then hit "log off" from the desktop menu. > Immediately, ALL the previous SSH connections started in step 1 get > closed, hence all the shells and the GUI apps (firefox, etc) ! > > Everything is done using the same local and remote users (same UID but > different names). sshd is the parent process of all my remote SSH sessions. > > I don't get how apps and shells NOT started via the X session, moreover > previously to its creation, are closed when the X session closes, what's > happening here ?! > As the outcome is the same with VNC and rdesktop, I guess the problem is > lying in the OS. Could it be related to logind ? Or an SSH(d) setting ? That sounds like what is documented here, with the solution at the end: $ apt show dbus-user-session Package: dbus-user-session Version: 1.12.24-0+deb11u1 [... some output snipped for brevity ...] Description: simple interprocess messaging system (systemd --user integration) D-Bus is a message bus, used for sending messages between applications. Conceptually, it fits somewhere in between raw sockets and CORBA in terms of complexity. . On systemd systems, this package opts in to the session model in which a user's session starts the first time they log in, and does not end until all their login sessions have ended. This model merges all parallel non-graphical login sessions (text mode, ssh, cron, etc.), and up to one graphical session, into a single "user-session" or "super-session" within which all background D-Bus services are shared. . Multiple graphical sessions per user are not currently supported in this mode; as a result, it is particularly suitable for gdm, which responds to requests to open a parallel graphical session by switching to the existing graphical session and unlocking it. . To retain dbus' traditional session semantics, in which login sessions are artificially isolated from each other, remove this package and install dbus-x11 instead. [...]
