SSH – Enable Auto-Logout of Interactive SSH Logins

linuxopensshsshsshd

I have requirement where I want my ssh seesion to target will logout after one hour,but currently leaving an ssh session to target board idle does not get auto logout after one hour.

Below is what is set in tagets sshd_config file

ClientAliveInterval 15

ClientAliveCountMax 4

So what changes I need to do so that my ssh session gets logged out after hour if it remains idle.

Best Answer

I already encountered situations where ClientAliveCountMax prevents the connection to be disconnected. I would advise the following settings:

# ClientAliveInterval is in seconds
ClientAliveInterval 3600
ClientAliveCountMax 0

This will close the connection after 1 hour if idle.

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Ubuntu 9.05 – Why SSH Password Prompt Takes Forever

Is it possible it's doing a reverse DNS lookup on your IP? You can check the results online if the client is using a public IP address, or use something like the following from your server:

dig -x CLIENT_IP_ADDRESS

Is there anything in /var/log/messages?

Windows – PuTTY/SSH: How to Prevent Auto-Logout

When you need only port forwarding, you can try if you disable starting a shell at all, and disable allocating a pseudo-terminal. Then the terminal can no longer be idle. :-)

If your ISP does not allow this, you can run a script like this in your shell session

while sleep 60; do
    echo "Still there"
done

so that the terminal shows activity and it should not be logged out.

But it depends on the operating system they are using which option will help. You did not tell us, did you? uname -a is your friend.

Best Answer

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Ubuntu 9.05 – Why SSH Password Prompt Takes Forever

Windows – PuTTY/SSH: How to Prevent Auto-Logout

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