FreeBSD8.1 Putty Telnet appears using keyboard-interactive authentication

Today with Putty a FreeBSD8.1 system, installed after the remote landing with the putty, has been prompted using keyboard-interactive authentication, meaning the need for interactive keyboard authentication method, can not be logged through the password method. The general situation is as follows: QUOTE:
Login As:root
Using keyboard-interactive authentication.
Password:
Access denied
Using keyboard-interactive authentication. Search the Internet, because Sshd_config uses the default settings, in the default case,/etc/ssh/sshd_config is a line of information commented out on the line
Remove the comment permitrootlogin = yes to log in with root;

But on this simple question, I was so burned, I looked for a long time did not find that line of data ...
After contacting a master colleague to solve the problem, the original/etc/ssh/under two files very similar ssh_config sshd_config. Because I often use the tab padding feature, I don't see it so well that I can't find that line of data.
Be careful, be careful