Scp error

[owner-ssh]

Hi 
I am trying to secure copy (scp) from one solaris box to another it fives me
following error:
Accepting host 172.16.1.11 key without checking
Disconnected, Authentication error (no further authentication methods
available)
connection lost.
I am able to ssh to all the servers but can't do scp What could be the
problem?
Please Help
Thanks
Bhavesh