I am guessing you are using the websocket client? This would be the
exception you get if the connection failed. I don't think Undertow
does any logging, so you must be logging this at the ERROR level.

As to why it is failing it is hard to say. How good is the network
between the client and the target server, and how often is a lot?

Also what version were you using before 1.4.12.Final?

Stuart

On Thu, Apr 13, 2017 at 12:15 AM, Hicks, Matt <matt@matthicks.com> wrote:
> I seem to be experiencing a lot of:
>
> [XNIO-1 task-40] ERROR i.y.E.defaultHandler.???:23 -
> java.nio.channels.ClosedChannelException
>     at io.undertow.protocols.ssl.SslConduit.write(SslConduit.java:369)
>     at
> org.xnio.conduits.ConduitStreamSinkChannel.write(ConduitStreamSinkChannel.java:150)
>     at
> org.xnio.http.HttpUpgrade$HttpUpgradeState$StringWriteListener.handleEvent(HttpUpgrade.java:385)
>     at
> org.xnio.http.HttpUpgrade$HttpUpgradeState$StringWriteListener.handleEvent(HttpUpgrade.java:372)
>     at
> org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
>     at
> org.xnio.conduits.WriteReadyHandler$ChannelListenerHandler.writeReady(WriteReadyHandler.java:65)
>     at
> io.undertow.protocols.ssl.SslConduit$SslWriteReadyHandler.writeReady(SslConduit.java:1225)
>     at io.undertow.protocols.ssl.SslConduit$3.run(SslConduit.java:275)
>     at org.xnio.nio.WorkerThread.safeRun(WorkerThread.java:580)
>     at org.xnio.nio.WorkerThread.run(WorkerThread.java:464)
>
> I'm not positive this is connected to my update to 1.4.12.Final, but I
> wanted to check to see if this is something anyone else is seeing?  It's
> likely it's related to my code, although I have no idea what I would have
> changed to cause this.
>
> _______________________________________________
> undertow-dev mailing list
> undertow-dev@lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/undertow-dev