Query on window adjust in SSH server

Ángel González keisial at gmail.com
Thu Mar 20 07:48:04 EST 2014

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 
go missing in the client-server communication?

More information about the openssh-unix-dev mailing list