Linux - Putty Login session error


We were running our in-house Debtors month-end using the ‘Putty’ software to login to Linux. Towards the end it disconnected the session and we had an incomplete month-end. Our OS windows 7,8 & 10.
I have attached error.

Kindly assist please.


. Are you able to ping the linux server ip

# ping ipaddress

. If it’s pinging then check the port is opened or not on remote machine usually putty works on openssh, so check whether openssh is running on remote machine or not

use telnet to check the connection

# telnet ipaddress 22

for checking the status of ssh on remote machine

# service sshd status

# ps -ef | grep -i sshd