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https://issues.apache.org/jira/browse/SSHD-411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14329706#comment-14329706
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Rob Moore commented on SSHD-411:
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This occurs in org.apache.sshd.server.sftp.SftpSubsystem at line 791.
This ticket is somewhat related to SSHD-116 in terms of how the code should
respond to a SSH command that is unrecognized.
> SSH_FX_OP_UNSUPPORTED should not be logged as error
> ---------------------------------------------------
>
> Key: SSHD-411
> URL: https://issues.apache.org/jira/browse/SSHD-411
> Project: MINA SSHD
> Issue Type: Improvement
> Affects Versions: 0.12.0
> Reporter: Rob Moore
>
> Clients can send unsupported SFTP messages but it doesn't seem like this is
> an error in terms of the SFTP implementation but rather something invalid
> that the client has chosen to do. While I think it makes sense to respond to
> the client with an error, it seems questionable whether it should be logged
> at this level.
> We are seeing "-56" sent quite frequently by clients and our monitoring is
> triggered since it's logged as an error.
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