Authentication Failed

I was trying to secure a Solaris 11.1 server. Under Solaris 10, that included setting the shell for user "adm" in /etc/password to /dev/null. So, I did that. I also uncommented  the UMASK in /etc/default/login and set the umask to 027. I uncommented "SYSLOG_FAILED_LOGINS=5" and changed the "5" to "0". Shortly after that, I discovered that I could no longer log into the system. A password-less ssh I'd set up for a particular user from another system now requested a password and, even when the proper password was supplied, it was rejected. Logging on to the system in multi-user mode