Mosh-server exits after closing initial SSH session

[geoff-sheldon]

On a Manjaro server and Debian Client config, the mosh client is able to SSH in, start mosh-server, then grab the connection details and exit, but when it attempts to connect via UDP nothing is received from the server.

I was able to connect by manually running mosh-server on the server, then copying the key and running mosh-client on my Debian client. However, if the session that spawned the mosh server is closed, the mosh server dies immediately. Here's how I tested the issue and arrived at this conclusion:

• SSH from Debian client to Manjaro server (success)
• start a tmux session within SSH session (success)
• start mosh server in tmux session (success)
• detach tmux session but leave SSH connection open (success)
• start a new mosh-client connection using the details from above (success)
• attach the tmux session to the new Mosh session (success, I can even see the mosh connection details in the tmux pane)
• close the original SSH session that is not currently showing tmux output (FAIL)

I believe the same is happening when I run mosh by itself, even though the mosh server reports that it is detached from the terminal session it definitely is not.

[Crest]

Does it make a difference if you logged into the system with an other SSH session? Do processes started with nohup/tmux/screen keep running if you logout? Has systemd been (mis-)configured to kill all processes on closing all login sessions? Are any errors written to stdout/stderr or syslog?

[raduc]

I had a similar issue with Siduction and the above comment helped me find that there was a line KillUserProcesses=yes in /etc/systemd/logind.conf. Commenting it out made mosh work again.

See also a similar issue: https://github.com/mobile-shell/mosh/issues/1171

Hope it helps.