SCP and ssh

I can't get ssh ans scp to work between to host on my network. I am prompted for the password and it isn't accepting the password and I know the password is correct because I am using the root password. What do I need to do to get ssh working between the two host and scp. I can putty into the server so I know ssh is running on the servers, but if I try to ssh from one unix box to another I get something that says rsa key is not authenticated I press yes and then it prompts me for the passwrod and then when I type the password it denies me the root passwords are the same on both systems. I need help?????????????

Look in the sshd_config file to see if PermitRootLogin is set to yes.

Settint PermitRootLogin to yes -- is a very bad idea.
NEVER doing it.
for ssh use su/sudo
for scp use usual account.