Finally I solved the issue with ssh login under root.
In my case the problem was that parameter "AllowRootLogin yes" wasn't uncommented and it was my fault of course. I uncommented this parameter and now it's OK.
Do excuse me please for misleading and ty for trying to help me.
i have tried to remote login into freebsd 7.1, but it is throwing PAM: authentication error for root. I have only one login that is root. No other user i have created since i am only using. I am not able to login through putty or winscp?