Error establishing Websockets

Enonic version: 7.4.1
OS: ubuntu

Hello,

We run the XP 7.4.1 in docker container and we use following applications:

  • Content Studio
  • Content Viewer App
  • Data Toolbox
  • Guillotine
  • Live Trace

We map the following ports of XP out of docker container:

  • “1099:1099”
  • “2609:2609”
  • “3000:3000” # Profiling test
  • “3001:3001” # Profiling test
  • “4848:4848”
  • “5005:5005” # Remote debugging test
  • “8080:8080”

Sometimes I see the error message while working in Content Studio:

Do you know what is wrong, where the error comes from and how to get rid of it?
Here is the XP console log:

09:17:02.797 WARN c.e.x.admin.event.impl.EventEndpoint - Errored websocket 228
org.eclipse.jetty.io.EofException: null
at org.eclipse.jetty.io.ChannelEndPoint.flush(ChannelEndPoint.java:279)
at org.eclipse.jetty.io.WriteFlusher.flush(WriteFlusher.java:422)
at org.eclipse.jetty.io.WriteFlusher.write(WriteFlusher.java:277)
at org.eclipse.jetty.io.AbstractEndPoint.write(AbstractEndPoint.java:381)
at org.eclipse.jetty.websocket.common.io.FrameFlusher.flush(FrameFlusher.java:264)
at org.eclipse.jetty.websocket.common.io.FrameFlusher.process(FrameFlusher.java:193)
at org.eclipse.jetty.util.IteratingCallback.processing(IteratingCallback.java:241)
at org.eclipse.jetty.util.IteratingCallback.iterate(IteratingCallback.java:223)
at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.outgoingFrame(AbstractWebSocketConnection.java:584)
at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.close(AbstractWebSocketConnection.java:181)
at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.onFillable(AbstractWebSocketConnection.java:511)
at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.onFillable(AbstractWebSocketConnection.java:441)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Broken pipe
at java.base/sun.nio.ch.FileDispatcherImpl.writev0(Native Method)
at java.base/sun.nio.ch.SocketDispatcher.writev(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at java.base/sun.nio.ch.SocketChannelImpl.write(Unknown Source)
at java.base/java.nio.channels.SocketChannel.write(Unknown Source)
at org.eclipse.jetty.io.ChannelEndPoint.flush(ChannelEndPoint.java:273)
… 22 common frames omitted