wrong with ssh2

[chen yuan]

Dear all:
   I have installed both the newest version of ssh1 and ssh2 on my
redhat 6.1, the problem is I can only connect to the server by using the
ssh1. When I connected the server by using the ssh2 clients: The
following error appeared:
Disconnected; authentication error (No further authentication methods
available.)
I donot know what is wrong with ssh2.
Chen Yuan