For security reason by default disabled SSH access for root user. But You can login other user and use root privileges with SUDO command. But sometimes We need ssh login for root user.
You can easily open that access but recommended disable SSH access for root user after finishing your job.
First you need to open ssh config file one of the following commands:
nano /etc/ssh/sshd_config or vim /etc/ssh/sshd_config or vi /etc/ssh/sshd_config
After that you need to add this line on Authentication section.
PermitRootLogin yes
Save and exit from sshd_config file.
Last you need to restart ssh service with this command:
service sshd restart
Now You can connect to the server with root user.
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GOOD LUCK!!!
