Re: [JSch-users] Session.SSH_MSG_USERAUTH_BANNER

[<ym...@jc...>]

Hi,

   +-From: "Matthew C. Jucius" <mj...@ci...> --
   |_Date: Mon, 29 Nov 2004 10:33:32 -0500 __
   |
   |I am getting the following NullPointerException in UserAuth.start()
   |when connecting to a particular host.<br>
   |<br>
   |<tt>java.lang.NullPointerException<br>
   |at com.jcraft.jsch.UserAuthNone.start(UserAuthNone.java:83)<br>
   |at com.jcraft.jsch.Session.connect(Session.java:290)<br>
   |at com.jcraft.jsch.Session.connect(Session.java:138)<br>
   |at com.cisco.aidan.io.SSHConnection.&lt;init&gt;(SSHConnection.java:132)</tt><br>
   |<br>
   |It appears to be in an if block checking for the
   |Session.SSH_MSG_USERAUTH_BANNER flag.&nbsp; Does anyone know what that
   |means?&nbsp;
   ...
   |From the exception, it is failing because the userinfo value is null.

Have you setted your own implementation of 'com.jcraft.jsch.UserInfo' 
interface by 'jsch.setUserInfo' method?

Anyway, SSH_MSG_USERAUTH_BANNER means that your sshd has wanted to
show you some warning messages.  Here is a quote from ssh spec,

  >In some jurisdictions, sending a warning message before
  >authentication may be relevant for getting legal protection.  Many
  >UNIX machines, for example, normally display text from `/etc/issue',
  >
  >The SSH server may send a SSH_MSG_USERAUTH_BANNER message at any time
  >before authentication is successful.  This message contains text to
  >be displayed to the client user before authentication is attempted.


Thanks,
--
ymnk