[JSch-users] SCP and SFTP produce "Auth cancel" exception

[pafau k <rk...@gm...>]

Hello,

I'm trying to do SCP file transfer with username/password
auth (no keys involved). I'm using almost verbatim version
of example http://www.jcraft.com/jsch/examples/ScpToNoneCipher.java.

There are two servers, sitting side by side, one of which
works fine, other produces "Auth cancel" exception (Session.java:448).

[good server]
Login or failure takes about 4-5 seconds.
On failure produces "Auth failed" exception.

[bad server]
No matter if given correct or incorrect credentials,
_instantly_ (less than 1 sec) produces "Auth cancel" exception.

Manual SCP ('scp file user@good_or_bad_server') works fine.

On both servers command 'ssh -V' produces:
OpenSSH_4.3p2 Debian-9, OpenSSL 0.9.8c 05 Sep 2006

My intuition tells me, that problem may be buried in this file:

----------------------------------+---------------------+-------------------------+
| /etc/ssh/sshd_conf differences  | [good server value] | [bad server
value]      |
+---------------------------------+---------------------+-------------------------+
| LoginGraceTime                  | 600                 | 120
           |
| AuthorizedKeysFile              | #commented out      |
%h/.ssh/authorized_keys |
| ChallengeResponseAuthentication | #commented out      | no
           |
| PasswordAuthentication          | no                  | #commented
out          |
| KeepAlive                       | yes                 | -no entry-
           |
| TCPKeepAlive                    | -no entry-          | yes
           |
+---------------------------------+---------------------+-------------------------+

...although what most of these properties mean - I'm bereft of notion.
Hopefully one of you knows it? If go and start shouting at the administrator
I'd better know what I'm doing :)

Since trying Sftp (as per http://www.jcraft.com/jsch/examples/Sftp.java)
produces the same exact result ('Auth cancel' on bad server), i strongly
suspect sshd_conf of inducing this mischevous behaviour.

If anyone is able to clear those things for me - i'd be very grateful.

greets

-- 
pafau k.