sshd and pam

[cartman_step1 at spymac.com]

Hello !
Just i have a question about ssh and pam .
Trying to login on a machine with freebsd 5.4 from a machine in where i run
fedora core 4 , i can't complete the operation . 
The error is sshd[449] pam authentication error . What does it mean?How i can set
pam to permit to login to freebsd and control the machine remotely?
I'm new to freebsd and i appreciate if anyone can help me to solve the problem . 
Thanks in advice