How to Kill Inactive SSH Sessions

So you’ve been disconnected from your server which resulted in an idle user session. You know this because when you used the “w" command, you see something like the following:

22:47:28 up 285 days, 21:09, 2 users, load average: 1.04, 1.17, 1.30
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/0 ipxxx-xxx-xxx-xxx 23:54 26:40 9.26s 0.86s -bash
root pts/1 ipxxx-xxx-xxx-xxx 22:44 0.00s 0.00s 0.00s w

There are a few ways to kill idle sessions. Including editing you sshd_config. But here’s an easy after-the-fact method:

Run this command:

pstree -p

the output will look something like this:

├─sshd(3102)─┬─sshd(3649)───bash(3656)
│            └─sshd(16680)───bash(16687)───pstree(17073)

Now look for the parent PID of the session – PID from the line WITHOUT the “pstree” command.

To kill session, type:

kill 3649

Replace 3649 with your idle ssh’s PID. Check afterwards with the “w” command.

Now to prevent this from happening in the future you can edit your server’s /etc/ssh/sshd_config and add these lines:

ClientAliveInterval 600
ClientAliveInterval 3
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