Allow users ssh

Step # 1: Open sshd_config file
# sudo vi /etc/ssh/sshd_config

Step # 2: Add a user
Only allow user vivek to login by adding following line:
AllowUsers vivek

Step # 3: Restart sshd
Save and close the file. In the above example, user vivek has already been created on the system. Now just restart sshd:
#  sudo systemctl restart sshd.service

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