Set SSH timeout in Amazon EC2 instance - CentOS 7

Question

I'm using CentOS 7 and trying to set time-out to 15 sec

in /etc/ssh/sshd_config set

ClientAliveInterval 15
TCPKeepAlive no
ClientAliveCountMax 1

restarted sshd service but SSH session is active after 15 sec

added also

TMOUT=15 to /etc/profile

but still nothing

Answer 1

After lot of googling found it out:

/etc/ssh/sshd_config has no any effect, it's meant for when the connection between the ssh client and the ssh server become unresponsive

cat /etc/profile.d/ssh-timeout.sh
export TMOUT=15
readonly TMOUT

and reboot