About ssh login

[Ritesh Yeole]

Dear Sir,
                I want to ssh to my client ,there is sonic-firewall .

In firewall  static ip nat with server ip
Now i want to ssh it then it ask for password but when passwd put is says=
[root at ndtest ~]# ssh ultra
root at ultra's password:
Permission denied, please try again.
root at ultra's password:
Permission denied, please try again.
root at ultra's password:
Permission denied (publickey).
=================[root at ndtest ~]# ssh raisoni
root at raisoni's password:
Permission denied, please try again.
root at raisoni's password:
Permission denied, please try again.
root at raisoni's password:
Permission denied (publickey,gssapi-with-mic,password).
[root at ndtest ~]#


Plz tell me what is difference between them and how it is solved.


Thanks
Ritesh
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