Steps to enable password access

Step 1 : Open putty

1. Open Putty App

Paste Public IP under session category

2. Select location for putty log file under Logging category

3. Browse and select private PPK format key file under Auth category under SSH

And click on Open

Now Putty is open.

Step 2 : Switch from opc user to root user

as we are login first time, we will login from opc user

1. Switch to root user

Sudo su -root

2. Now set password for root user

passwd root

and then write password.

Step 3 : Enable password based login

1. Go to the ssh service under etc directory

cd /etc/ssh

and list all files & directories in ssh

ls -lrth

2. Now take backup of sshd_config file using copy command

cp sshd_config sshd_config_bkp

*sshd_config_bkp (backup file name)

and again list all files & directories to check backup file is created or not.

ls -lrth

3. After taking backup, we open the sshd_config file and edit it

vi sshd_config

4. Look up permit root login, then add permit root login yes below, ensuring it isn't preceded by #, using the Insert button.

5. Search for password authentication then add password authentication yes below, ensuring it isn't preceded by #, using the Insert button.

(6) Next,Find the path where changes can be made to enable password authentication.

Press shift / include

and we will get the path for file (In which we have to do modification)

Include /etc/ssh/sshd_config.d/*.conf

(7) Next, exit from file sshd_config and run again ls -lrth and look for sshd_config.d

Enter in sshd_config.d folder and run ls -lrth

and look for 50-cloud-init.conf file

Now, Run vi 50-cloud-init.conf

Search for password authentication and change it to yes, using Insert Button.

To save the file

:wq!

(shift+: wq!)

enter

5. check difference between both files before restarting the server

diff sshd_config sshd_config_bkp

6. Now check the status of the server as well

systemctl status sshd

7. lastly Restart the server

systemctl restart sshd

8. Before logging out of the current session, keep it open and log in from a new session.

If the new session opens successfully, you can log out. If not, try to fix the error in the sshd file while in the current session.