Home / ubuntu / Questions / 137632
Accepted
David Oneill
Asked: 2012-05-16 16:13:16 +0800 CST

How do I terminate all idle incoming ssh connections?

  • 772

I want to be able to automatically terminate ssh connections that are idle for more than 10 minutes.

How do I do this?

ssh

2 Answers

  1. Best Answer

    Open up terminal, Ctrl-Alt-T. Then:

    • sudo gedit /etc/ssh/sshd_config

    • Set (or modify) the following options:

      ClientAliveInterval 600
ClientAliveCountMax 0

    • Save and exit the editor.

    • Run sudo service ssh restart

    ClientAliveInterval sets the period after which, if the server sees the client as idle, it will send a "keep alive" request. If it gets no response, the client is disconnected. ClientAliveCountMax is the number of times such a keep alive is requested before disconnection. By setting it to 0, the keepalive is never sent and all clients idle for more than 10 minutes (600 seconds) are disconnected.

    • 7

  2. Edit /etc/ssh/sshd_config

    sudo vim /etc/ssh/sshd_config

    Add in this file the ClientAliveInterval option in seconds.

    By the MAN page of sshd_config, that you can check here :

    ClientAliveInterval: 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 only.

    • 3