If you manage Oracle Solaris 10 machines, you might want to configure your servers to accept Kerberos principals via SSH. The SSH that comes with Solaris 10 does not understand the same configurations as the OpenSSH one does. And Solaris has a little quirk that Linux and BSD don't.
If you don't already have a Kerberos infrastrucutre in place, then the first thing to do is to set one up. Read my other article HOWTO : Kerberos KDC with OpenLDAP 2.4 Back-End and SASL GSSAPI Authentication on CentOS 6.2 to learn how to create a Kerberos realm.