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https://issues.apache.org/jira/browse/SSHD-869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16872622#comment-16872622
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Aruna Potti commented on SSHD-869:
----------------------------------
[~lgoldstein] Sorry I was not able to attach the screen shot. I was referring
about below keep-alive machanisms,
[https://github.com/apache/mina-sshd/blob/master/docs/client-setup.md]
* Sending {{SSH_MSG_IGNORE}} messages every once in a while.
This mechanism is along the lines of [PUTTY null packets
configuration|https://patrickmn.com/aside/how-to-keep-alive-ssh-sessions/]. It
generates small
[{{SSH_MSG_IGNORE}}|https://tools.ietf.org/html/rfc4253#section-11.2] messages.
The way to set this mechanism up is via the {{setSessionHeartbeat}} API.
_Note:_ the same effect can also be achieved by setting the relevant properties
documented in {{SessionHeartbeatController}}, but it is highly recommended to
use the API - unless one needs to control these properties *externally* via
{{-Dxxx}} JVM options.
* Sending {{keepalive@...}} [global
requests|https://tools.ietf.org/html/rfc4254#section-4].
> java.security.SignatureException: error decoding signature bytes.
> -----------------------------------------------------------------
>
> Key: SSHD-869
> URL: https://issues.apache.org/jira/browse/SSHD-869
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 0.14.0
> Reporter: Aruna Potti
> Priority: Major
>
> Below exception is seen with some ssh keys. I need a fix/workaround in 0.14.0
> version as I can not upgrade the version in my product.
>
> Exception caught
> java.security.SignatureException: error decoding signature bytes.
> at
> org.bouncycastle.jcajce.provider.asymmetric.dsa.DSASigner.engineVerify(Unknown
> Source)[bcprov-jdk15on-1.59.jar:1.59.0]
> at
> java.security.Signature$Delegate.engineVerify(Signature.java:1219)[:1.8.0_66]
> at java.security.Signature.verify(Signature.java:652)[:1.8.0_66]
> at
> org.apache.sshd.common.signature.AbstractSignatureDSA.verify(AbstractSignatureDSA.java:88)[53:org.apache.sshd.core:0.14.0]
> at
> org.apache.sshd.client.kex.DHGEX.next(DHGEX.java:163)[53:org.apache.sshd.core:0.14.0]
> at
> org.apache.sshd.common.session.AbstractSession.doHandleMessage(AbstractSession.java:425)[53:org.apache.sshd.core:0.14.0]
> at
> org.apache.sshd.common.session.AbstractSession.handleMessage(AbstractSession.java:326)[53:org.apache.sshd.core:0.14.0]
> at
> org.apache.sshd.client.session.ClientSessionImpl.handleMessage(ClientSessionImpl.java:306)[53:org.apache.sshd.core:0.14.0]
> at
> org.apache.sshd.common.session.AbstractSession.decode(AbstractSession.java:780)[53:org.apache.sshd.core:0.14.0]
> at
> org.apache.sshd.common.session.AbstractSession.messageReceived(AbstractSession.java:308)[53:org.apache.sshd.core:0.14.0]
> at
> org.apache.sshd.common.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:54)[53:org.apache.sshd.core:0.14.0]
> at
> org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:184)[53:org.apache.sshd.core:0.14.0]
> at
> org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:170)[53:org.apache.sshd.core:0.14.0]
> at
> org.apache.sshd.common.io.nio2.Nio2CompletionHandler$1.run(Nio2CompletionHandler.java:32)
> at java.security.AccessController.doPrivileged(Native
> Method)[:1.8.0_66]
> at
> org.apache.sshd.common.io.nio2.Nio2CompletionHandler.completed(Nio2CompletionHandler.java:30)[53:org.apache.sshd.core:0.14.0]
> at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126)[:1.8.0_66]
> at sun.nio.ch.Invoker$2.run(Invoker.java:218)[:1.8.0_66]
> at
> sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)[:1.8.0_66]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_66]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_66]
> at java.lang.Thread.run(Thread.java:745)[:1.8.0_66]
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