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https://issues.apache.org/jira/browse/SSHD-786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Goldstein Lyor reopened SSHD-786:
---------------------------------
Seems that under certain circumstances, the code in {{onFailed}} that attempts
to re-engage the _accept_ call fails with {{AcceptPendingException}}.
{code:java|title=Nio2Acceptor#AcceptCompletionHandler#onFailed}
try {
// Accept new connections
socket.accept(address, this);
} catch (Throwable t) {
// Do not call failed(t, address) to avoid infinite recursion
log.error("Failed (" + t.getClass().getSimpleName()
+ " to re-accept new connections on " + address
+ ": " + t.getMessage(), t);
}
{code}
according to the exception's documentation
{quote}
Unchecked exception thrown when an attempt is made to initiate an accept
operation on a channel and a previous accept operation has not completed.
{quote}
Since this happens intermittently and more often on _Linux_ rather than
_Windows_ (as a matter of fact I have not encountered it on _Windows_ yet), it
seems like either some race condition or different code in different JDK
versions. We need to find some way to "complete" the handling of {{onFailed}}
and somehow signal that we want to re-accept connections, while at the same
time avoiding an infinite failure loop.
> Clients can't authenticate after unexpected exception in Nio2Acceptor
> ---------------------------------------------------------------------
>
> Key: SSHD-786
> URL: https://issues.apache.org/jira/browse/SSHD-786
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 1.2.0, 1.3.0, 1.4.0, 1.6.0
> Environment: Windows
> Reporter: masc
> Assignee: Goldstein Lyor
> Priority: Major
> Fix For: 1.7.0
>
>
> {code}
> 2017-11-28 15:26:54,808 11566202 sshd-SshServer[434a2a10]-nio2-thread-4
> org.apache.sshd.common.io.nio2.Nio2Acceptor WARN - Caught IOException while
> accepting incoming connection from /0:0:0:0:0:0:0:0:13003: The specified
> network name is no longer available.
> java.io.IOException: The specified network name is no longer available.
> at sun.nio.ch.Iocp.translateErrorToIOException(Iocp.java:309)
> at sun.nio.ch.Iocp.access$700(Iocp.java:46)
> at sun.nio.ch.Iocp$EventHandlerTask.run(Iocp.java:399)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> As soon as this exception occurs once, clients can still connect but will
> fail to authenticate.
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