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https://issues.apache.org/jira/browse/SSHD-903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16779650#comment-16779650
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Goldstein Lyor commented on SSHD-903:
-------------------------------------

Strange AFAIK it should have worked - unfortunately I am a bit swamped at this 
moment so I don't know when I can get to it soon. However, off the top of my 
head:

* Is there any way you can force WinSCP to use version 3 ?
* Can you spare some time and maybe diagnose what is causing the original 
corruption you mention ?
* Can you try the latest checked in SNAPSHOT version ? We have made some 
changes to SFTP - nothing like what you are experiencing, but perhaps 
inadvertently it also fixed the problem you are describing.

> SFTP version negotiation does not work  
> ----------------------------------------
>
>                 Key: SSHD-903
>                 URL: https://issues.apache.org/jira/browse/SSHD-903
>             Project: MINA SSHD
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Mark Ebbers
>            Priority: Major
>         Attachments: sftp-version-1.png, sftp-version-2.png
>
>
> I have some problems with uploading files to our MINA SSHD based SFTP server 
> when using ,different version, of WinSCP as SFTP client. WinSCP is configured 
> to use version 6 of the SFTP protocol if possible. 
> Uploading a file of ~ 45KB sometimes result in a file of 32711 bytes where in 
> the data is not appended (from the second SFTP packet) but overwritten. (But 
> did not pin point the exact bug)
> As a temporary solution I found, in issue SSHD-874, a comment which suggest 
> to force the server to use sftp-protocol version 3. If I do this I expect the 
> server to negotiate with the client that version 3 should be used instead of 
> version 6. But what happens is that the server sends a not supported message.
>  
> I think that the AbstractSftpSubsystemHelper::checkVersionCompatibility() is 
> the problem.
> See my screenshots. As you can see the version proposed by WinSCP is version 
> 6. I forced the server on version 3.



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