http://haydenjames.io/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 [email protected] 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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