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https://issues.apache.org/jira/browse/SSHD-795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351804#comment-16351804
 ] 

Goldstein Lyor commented on SSHD-795:
-------------------------------------

See 
[https://github.com/lgoldstein/mina-sshd/commit/308887c407ce7e1f9af73c105ead1426273c1d34]
 - is that satisfactory ? You can test it by cloning 
[https://github.com/lgoldstein/mina-sshd/commits/SSHD-801] and compiling it.

> IOException (Broken pipe) on a socket local forwarding channel causes SSH 
> client-server connection down
> -------------------------------------------------------------------------------------------------------
>
>                 Key: SSHD-795
>                 URL: https://issues.apache.org/jira/browse/SSHD-795
>             Project: MINA SSHD
>          Issue Type: Bug
>    Affects Versions: 1.7.0
>            Reporter: Roberto Deandrea
>            Priority: Major
>         Attachments: apache-sshd.trace.zip, brokenpipe.trace
>
>
> Hi,
> I have a problem with local port forwarding mechanism implemented in Apache 
> SSHD.
> In my company we successfully use Apache SSHD library for secure local socket 
> forwarding protocols.
> When on a local port forwarding channel an IOException (Broken pipe) happen 
> for some reason (network, etc...), the SSH client server is being 
> disconnected abruptly.
> I'm not convinced this is the right behavior. I think it is not necessary to 
> bring down SSH client server connection because this is not a protocol 
> violation, but a socket problem related to forwarded remote server connection.
> Please, can you comment about this issue ?
> Follow an excerpt of the traces :
> {quote}
> 2018-01-23 10:30:10,017 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-2       ] 
> [Nio2Session.handleWriteCycleFailure] 
> handleWriteCycleFailure(Nio2Session[local=/192.168.180.70:38957, 
> remote=/192.168.10.31:36228]) failed (IOException) to write 32768 bytes: 
> Broken pipe
> 2018-01-23 10:30:10,017 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-3       ] 
> [Window.waitForSpace] 
> waitForSpace(Window[server/remote](TcpipServerChannel[id=662, 
> recipient=11]-ServerSessionImpl[circessh@/192.168.190.2:14840])) available: 
> 1146880
> 2018-01-23 10:30:10,017 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-2       ] 
> [TcpipServerChannel.handleWriteDataFailure] 
> handleWriteDataFailure(TcpipServerChannel[id=662, 
> recipient=11]-ServerSessionImpl[circessh@/192.168.190.2:14840])[SSH_MSG_CHANNEL_DATA]
>  failed (IOException) to write len=32768: Broken pipe
> 2018-01-23 10:30:10,018 WARN  [sshd-SshServer[1786f9d5]-nio2-thread-2       ] 
> [AbstractSession.exceptionCaught] 
> exceptionCaught(ServerSessionImpl[circessh@/192.168.190.2:14840])[state=Opened]
>  IOException: Broken pipe
> 2018-01-23 10:30:10,018 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-3       ] 
> [Window.waitAndConsume] 
> waitAndConsume(Window[server/remote](TcpipServerChannel[id=662, 
> recipient=11]-ServerSessionImpl[circessh@/192.168.190.2:14840])) - 
> requested=32768, available=1146880
> 2018-01-23 10:30:10,018 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-2       ] 
> [AbstractSession.exceptionCaught] 
> exceptionCaught(ServerSessionImpl[circessh@/192.168.190.2:14840])[state=Opened]
>  details
> java.io.IOException: Broken pipe
>         at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
>         at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47)
>         at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
>         at sun.nio.ch.IOUtil.write(IOUtil.java:65)
>         at 
> sun.nio.ch.UnixAsynchronousSocketChannelImpl.finishWrite(UnixAsynchronousSocketChannelImpl.java:582)
>         at 
> sun.nio.ch.UnixAsynchronousSocketChannelImpl.finish(UnixAsynchronousSocketChannelImpl.java:195)
>         at 
> sun.nio.ch.UnixAsynchronousSocketChannelImpl.onEvent(UnixAsynchronousSocketChannelImpl.java:213)
>         at sun.nio.ch.EPollPort$EventHandlerTask.run(EPollPort.java:293)
>         at java.lang.Thread.run(Thread.java:745)
> 2018-01-23 10:30:10,023 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-1       ] 
> [Nio2Session.writePacket] 
> writePacket(Nio2Session[local=/192.168.180.70:45470, 
> remote=/192.168.10.31:22]) Writing 24780 bytes
> 2018-01-23 10:30:10,025 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-2       ] 
> [SessionTimeoutListener.sessionException] 
> sessionException(ServerSessionImpl[circessh@/192.168.190.2:14840]) 
> IOException: Broken pipe
> {quote}
>  



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