Query on window adjust in SSH server

abhilash abraham abhilashtabraham at gmail.com
Thu Mar 20 14:41:00 EST 2014

Hi Angel,

             Thanks for the reply.

             The message was seen in server. There is NO chance of frames
to be missing.

On Thu, Mar 20, 2014 at 2:18 AM, Ángel González <keisial at gmail.com> wrote:

> On 17/03/14 05:55, abhilash abraham wrote:
>> Hi,
>>        I have a problem regarding window adjust, in the SSH server.
>>   I was trying to get a file of 400K from a system, via SFTP, which has
>> old
>> version of openSSH [v2.0 or so] in it. I'm using Windows client,
>> filezilla,
>> to get thre file. Once it reaches ~12k, the transfer gets halted. On
>> debugging I could find that it has reached the maximum window size in the
>> server and the client is never again sending the window adjust message.
>>      In RFC, I couldn't find anything about handling this situation. Can
>> you
>> please let me know whether the server has the 'right' to adjust the window
>> size without the message from client. Or is there any reason for the
>> client
>> not sending the adjust message[like its not aware of window exhausted in
>> server]?
> This looks like a TCP question, not a sshd one.
> Were you viewing the messages on client or server? Is it possible that
> frames
> go missing in the client-server communication?


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