To set default session timeout / automatically logout inactive SSH sessions in Linux

Solution 1:

Edit the /etc/ssh/sshd_config file to set the parameter as follows:

# vi /etc/ssh/sshd_config

ClientAliveInterval 3600

ClientAliveCountMax 0

# service sshd reload          or,  

# service sshd restart

Solution 2:

The /etc/bashrc file is used to apply the timeout system wide but if you need it to be user specific then modify the ~/.bashrc file instead and add as below:

# echo "TMOUT=3600 >> /etc/bashrc

# echo "readonly TMOUT" >> /etc/bashrc

# echo "export TMOUT" >> /etc/bashrc

Log off, start a new session and wait for One Hour. Your session should terminate.