Mark Ebbers created SSHD-903:
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Summary: 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
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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