First do a ‘w’ command to get the ‘tty’ details of the session that you would like to terminate.
root pts/1 192.168.1.104 10:21 0.00s 0.03s 0.00s w
root pts/2 10.0.0.XX 16:26 0.00s 0.02s 0.00s w
In the above example, i have initiated another ssh session from 10.0.0.XX. To kill this session,
Find the PID of the process with
# ps -ft pts/2
# kill -9 11236
This will terminate the remote session.