Here are the steps to increase ssh timeout at the server level on Linux OS:
These steps are performed on CentOS:
Modify the following directives by editing the sshd config file: /etc/ssh/sshd_config
Restart SSH Demon after modifying the config file:
[root@mars ~]# service sshd restart
Stopping sshd: [ OK ]
Starting sshd: [ OK ]
Caution: only recommended in development environment.