strange message in logs, ssh breakin?

[Dave]

Hello,
    I've recently started seeing this in my security logs. This is on a 
freebsd6 box. Is this some kind of hack atempt?
Thanks.
Dave.

Mar  5 12:16:59 zeus sshd[33617]: login_getclass: unknown class 'root'
Mar  5 12:17:03 zeus sshd[33621]: login_getclass: unknown class 'root'
Mar  5 12:18:02 zeus sshd[33622]: fatal: Timeout before authentication for 
195.225.129.68