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Old 02-15-2005, 04:17 PM   #1
Registered: Dec 2004
Distribution: RHEL, CentOS, SuSE
Posts: 170

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Please help...I was wondering how do you get ssh to timeout and close connection after 20 minutes of inactivity. I am hoping to...stop those users from leaving a ssh session open while they are not using it... I am using suse pro and bash.

Also, if you can help, what is the best way to increase the cipher to aes256?

Thanks in advance for your help.

Last edited by XaViaR; 02-15-2005 at 04:23 PM.
Old 02-16-2005, 11:36 PM   #2
Registered: Feb 2002
Location: IL
Distribution: Ubuntu currently, also Fedora, RHEL, CentOS
Posts: 111

Rep: Reputation: 15
From the sshd_config manpage

Sets a timeout interval in seconds after which if no data has
been received from the client, sshd will send a message through
the encrypted channel to request a response from the client.
The default is 0, indicating that these messages will not be
sent to the client. This option applies to protocol version 2

In your sshd config, add the line

ClientAliveInterval 1200 #in seconds
Protocol 2 #Doesn't work on protocol 1

Then restart sshd and you are off and running.

For the AES,

once again in sshd_config (normally in /etc/ssh)

Add this line
CIPHERS aes256-cbc #you can add more options here, see man sshd_config for more

Restart sshd and again, everything is good
Old 02-17-2005, 10:42 AM   #3
Registered: Dec 2004
Distribution: RHEL, CentOS, SuSE
Posts: 170

Original Poster
Rep: Reputation: 31
thanks for your help!


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