For SSH security, we can configure the system to log out users after 15 minutes of inactivity. Edit the configuration as follows.
#vi /etc/ssh/sshd_config
Find the lines and change them to match the following.
ClientAliveInterval 15m # 15 minutes
ClientAliveCountMax 0 # 0 times
Then enter:
#service sshd restart
An SSH connection may fail with no matching host key type found when a newer client disables ssh-rsa and ssh-dss. These options configure compatibility.
If SSH to a Debian/Ubuntu server returns no hostkey alg, the SSH client failed the host key algorithm check while connecting. To fix it, check permissions…
If connecting to a server over SSH fails with "no hostkey alg", as in the example below: debug1: Reading configuration data /etc/ssh_config debug1: Connecting to 192.168.1.1 [192.168.1.1] port 22.
