I have a monitor server type Sun Solaris, and send the message
Authentication failed. Kindly verify the username and password provided, I proved and a can connect in shell to server with the same credentials.
In fact, I created a new credential because the promt was wrong, when I test credential is Passed but still send the message.
I checked with a telnet from Applications Manager Server to this machine and its Ok. Too, I checked the file hosts and is in it.