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https://issues.apache.org/jira/browse/SSHD-1292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17603061#comment-17603061
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Roberto Deandrea commented on SSHD-1292:
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Thank you for your support. Feel free to close this ticket.
Regards
Roberto
> Connection problem with Rebex Buru SFTP Server
> ----------------------------------------------
>
> Key: SSHD-1292
> URL: https://issues.apache.org/jira/browse/SSHD-1292
> Project: MINA SSHD
> Issue Type: Question
> Affects Versions: 2.8.0
> Reporter: Roberto Deandrea
> Priority: Major
>
> Hi Thomas,
>
> I have connection problems with a Microsoft SFTP server called Rebex SFTP
> Server
> ([https://www.rebex.net/buru-sftp-server/).|https://www.rebex.net/buru-sftp-server/)]
> This is a NEW connection setup for our SFTP client/server product.
>
> I have SFTP client based on Apache SSHD 2.8.0. The client is configured for
> pushing files to the Rebex SFTP server.
>
> Description of the problem :
> Sometimes the SFTP client is unable to push files on this remote SFTP
> Server, the SSH handshake fails during SSH handshake for an authentication
> timeout set to 60 secs that expires.
> The exception is the following :
> {quote}Caused by: org.apache.sshd.common.SshException:
> DefaultAuthFuture[ssh-connection]: Failed to get operation result within
> specified timeout: 60000
> at
> org.apache.sshd.common.future.AbstractSshFuture$$Lambda$284/0000000000000000.apply(Unknown
> Source)
> at
> org.apache.sshd.common.future.AbstractSshFuture.formatExceptionMessage(AbstractSshFuture.java:185)
> at
> org.apache.sshd.common.future.AbstractSshFuture.verifyResult(AbstractSshFuture.java:111)
> at
> org.apache.sshd.client.future.DefaultAuthFuture.verify(DefaultAuthFuture.java:39)
> at
> org.apache.sshd.client.future.DefaultAuthFuture.verify(DefaultAuthFuture.java:32)
> at
> org.apache.sshd.common.future.VerifiableFuture.verify(VerifiableFuture.java:56)
> at com.primeur.sshd.client.SSHDClient.connect(SSHDClient.java:157)
> {quote}
>
> When the connection fails, looking through the verbose logs of the client I
> sometimes found :
> [8/23/22 6:35:52:064 EDT] 0000bfcb id=00000000
> org.apache.sshd.common.channel.ChannelAsyncOutputStream 1 doWriteIfPossible
> doWriteIfPossible([SftpChannelSubsystem[id=0,
> recipient=0]-ClientSessionImpl[StateStreet@/127.0.0.1:40787][sftp]]
> cmd=SSH_MSG_CHANNEL_DATA) *delaying write until space is available in the
> remote window*
> This trace seems to evidence some issues writing data on socket according to
> SSH protocol....
> I've managed to handle this warning "delaying write until space is available
> in the remote window{*}"{*} setting the system property
> *-Dorg.apache.sshd.config.sftp-chunk-if-window-less-than-packet=true*
> without any improvement.
>
> The authentication timeout expires because the SSH messages related to client
> authentication are not sent and received between client and server.
>
> +Q. What do you think about this log ?+
>
> [8/23/22 6:35:52:285 EDT] 0000bfcf id=00000000
> common.session.helpers.ReservedSessionMessagesHandlerAdapter 1
> handleIgnoreMessage
> handleIgnoreMessage(ClientSessionImpl[StateStreet@/127.0.0.1:40787])
> *SSH_MSG_IGNORE*
>
> The receiving of some *SSH_MSG_IGNORE* messages from SFTP remote server could
> mean that the socket connection is in idle state and no data flow on the
> socket.
> +Q. Can you confirm ?+
>
> Q. Do you think that this issue is caused by external factor (i.e network
> latency/load, firewalls, balancers etc..... or is caused by some tricky SSH
> implementation details or interoperability issues with this SFTP server (less
> likely...) ?
>
> Thank you in advance for your cooperation.
> Regards, Roberto.
>
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