how to deny root ssh access in linux server
For security point of view we generally restrict root direct ssh access in server.But keep in mind you also must have user who can access the server other than root.
So before doing this practical ,check if you have access to server with other user or else create a new user with password.
useradd username passwd username
OK, now restrict the root from ssh follow the given below steps
Step 1 : Take the backup of sshd_config file
cp -p /etc/ssh/sshd_config /etc/ssh/sshd_config.backup
Step 2: Edit the sshd_config file and search for keyword PermitRootLogin
Bydefault PermitRootLogin is yes. Change the PermitRootLogin yes to no
vi /etc/ssh/sshd_config PermitRootLogin no
Step 3: After this change restart the ssh service.
In CentOs and Red Hat /etc/init.d/sshd restart In Debian and Ubuntu /etc/init.d/ssh restart
Now you can check it, use command