[jira] [Reopened] (SSHD-903) SFTP version negotiation does not work

["Mark Ebbers (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SSHD-903?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mark Ebbers reopened SSHD-903:
------------------------------

Cannot add screenshots on closed issue.

> 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
>            Assignee: Goldstein Lyor
>            Priority: Major
>         Attachments: screenshot-winscp-sftp-version.png, 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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