[JSch-users] Fwd: Session hang when connected with openSSH

[aarthit 2. <aar...@gm...>]

Hi ,

Thanks for the reply, when we added debugs we saw that the code hit
the part in this read function call on reaching the read call the
session freezes.

The value rmpzize we understand that is a value that comes from the
ssh server. we confirmed this by testing with different ssh servers.
The values were
OpenSSH server  32760
libSSH server 34902

This is not specific to a particular server. when we verified in 2
different servers we saw the same issue of session hang in the read
call .
when we change the value of this rmpsize starting from 1000 to 26608
for libssh server the session was working fine. which implies that the
client is not able to handle the size received from the SSH server.
But as per the RFC that we had already quoted the size obtained from
Openssh and libssh are also valid (32760 and 34902). Even they are
valid when the Jsch does a java read call it is not handling the
rmpsize properly. we suspect the issue with the java implementation.

Kindly share your thoughts.

Thanks
Aarthi


On Thu, May 22, 2014 at 11:16 AM, Atsuhiko Yamanaka <ym...@jc...> wrote:
>
> Hi,
>
>    +-From: aarthit 2014 <aar...@gm...> --
>    |_Date: Tue, 20 May 2014 10:45:33 +0530 _______
>    |
>    |The third parameter for the read() is derived from the rmpsize which is
>    |Remote max packet size which is received from the SSH server.
>
> No, that size means that how long data SSH server can receive.
> Have you confirmed that the program has freezed in read() method?
>
> I guess the program has freezed in sending data to the SSH server.
> I don't know the reason, but your network environment may have problems
> in transferring long data, or your SSH sever may have problems
> in receiving long data.
>
>
> Sincerely,
> --
> Atsuhiko Yamanaka
> JCraft,Inc.
> 1-14-20 HONCHO AOBA-KU,
> SENDAI, MIYAGI 980-0014 Japan.
> Tel +81-22-723-2150
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