Q. Previous admin blocked root access to ssh server. How do I allow root account access to ssh server

A. Allowing direct root access over ssh is a security risk. However following steps will allow you to login as root over ssh session:

Open sshd_config file:
# vi /etc/ssh/sshd_config

Find out line that read as follows:
PermitRootLogin no
Set it as follows:
PermitRootLogin yes

Find out line that read as follows (this line may not exists in your configuration):

DenyUsers root user2 user3
Set is as follows:

DenyUsers user2 user3
Save and close the file. Restart the sshd:

# /etc/init.d/ssh restart