Restrict and secure SSH shell access - Linux Administration

Step 1

Edit the ssh config files

# /etc/ssh/sshd_config

Change the following lines

#Port 22
#Protocol 2, 1
#ListenAddress 0.0.0.0

Step 2

For more security change the port number

Port 5678 (Any number in 1-5 digits, It should not conflict with gemneral ports. ex., 3306 is MySQL port)

Protocol 2

ListenAddress 64.18.127.85 (Your machine IP Address)

If you would like to disable direct Root Login, scroll down until you find

PermitRootLogin no

Step 3

Once file save restart SSHD service

# /etc/rc.d/init.d/sshd restart

Try your setting with a duplicate session to avoid access trap.