I cannot login as root when accessing the console via the MP (management processor).
I can su to root after logging in as me. So I know I have the correct root password, etc.
As you can see, there is an entry for console in /etc/securetty...
[root@myhost /root] # cat /etc/securetty
[root@myhost /root] #
And this is the result of trying to login as root on the console (via MP) with the correct password.
Console Login: root
FYI: This is an rx6600 running HPUX 11.31.
Make sure your password doesn't contain any special characters like @ ! # etc