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https://issues.apache.org/jira/browse/SSHD-1237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17480269#comment-17480269
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Thomas Wolf commented on SSHD-1237:
-----------------------------------
Looks like an OpenSSH server sends its keep-alive messages as channel requests
or as global requests, and expects a non-success reply at least for channel
requests. Simply logging only at debug level when the request name starts with
"keepalive@" or "keep-alive@" and log.isDebugEnabled() might be good enough.
Do you want to provide a PR on [Github|https://github.com/apache/mina-sshd]?
> SftpClient logs warnings on keepalive messages
> ----------------------------------------------
>
> Key: SSHD-1237
> URL: https://issues.apache.org/jira/browse/SSHD-1237
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 2.8.0
> Reporter: Jens Grassel
> Priority: Minor
>
> Hi,
> we just noticed that using the default SshClient we get lots of warning
> messages in our logs about keep alive requests like this:
> {noformat}
> 08:55:32.122 [sshd-SshClient[40b05dd]-nio2-thread-2] WARN
> o.a.s.s.c.i.DefaultSftpClient$SftpChannelSubsystem -
> handleUnknownChannelRequest(SftpChannelSubsystem[id=0,
> recipient=0]-ClientSessionImpl[XXX@XXX/XXX:22][sftp]) Unknown channel
> request: keepal...@openssh.com[want-reply=true]
> {noformat}
> We're using the {{SshClient.setUpDefaultClient()}} function then create our
> session and finally use the {{createSftpClient(session)}} function on a
> SftpClientFactory.
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