UT005028 ClosedChannelException in load balancer ------------------------------------------------ Key: WFLY-10265 URL: https://issues.jboss.org/browse/WFLY-10265 Project: WildFly Issue Type: Bug Components: Web (Undertow) Affects Versions: 11.0.0.Final Environment: Windows 10 or Windows Server 2016 Reporter: Robert Van Loenhout Assignee: Stuart Douglas I have installed Keycloak 3.4.3. I use a configuration with a load balancer with 2 (local) server instances. On a Linux machine (CentOS 7) I do not see any errors in the load balancer log. However on Windows (10 and 2016) I see the following errors in the load balancer log: {code} 2018-04-18 17:35:48,367 ERROR [io.undertow.proxy] (default I/O-4) UT005028: Proxy request to /auth/resources/3.4.3.final/admin/keycloak/templates/kc-paging.html failed: java.nio.channels.ClosedChannelException at io.undertow.client.ajp.AjpClientConnection$3.handleEvent(AjpClientConnection.java:122) at io.undertow.client.ajp.AjpClientConnection$3.handleEvent(AjpClientConnection.java:109) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) at io.undertow.server.protocol.framed.AbstractFramedChannel$FrameCloseListener.handleEvent(AbstractFramedChannel.java:1045) at io.undertow.server.protocol.framed.AbstractFramedChannel$FrameCloseListener.handleEvent(AbstractFramedChannel.java:959) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) at org.xnio.conduits.ReadReadyHandler$ChannelListenerHandler.terminated(ReadReadyHandler.java:71) at org.xnio.nio.NioSocketConduit.readTerminated(NioSocketConduit.java:332) at org.xnio.nio.NioSocketStreamConnection.notifyReadClosed(NioSocketStreamConnection.java:148) at org.xnio.Connection.close(Connection.java:139) at org.xnio.IoUtils.safeClose(IoUtils.java:152) at io.undertow.server.protocol.framed.AbstractFramedChannel.close(AbstractFramedChannel.java:793) at io.undertow.client.ajp.AjpClientConnection.close(AjpClientConnection.java:304) at org.xnio.IoUtils.safeClose(IoUtils.java:152) at io.undertow.server.handlers.proxy.ProxyHandler$IoExceptionHandler.handleException(ProxyHandler.java:770) at org.xnio.ChannelListeners.invokeChannelExceptionHandler(ChannelListeners.java:126) at io.undertow.util.Transfer$TransferListener.handleEvent(Transfer.java:193) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) at io.undertow.channels.DetachableStreamSourceChannel$SetterDelegatingListener.handleEvent(DetachableStreamSourceChannel.java:231) at io.undertow.channels.DetachableStreamSourceChannel$SetterDelegatingListener.handleEvent(DetachableStreamSourceChannel.java:218) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) at io.undertow.server.protocol.framed.AbstractFramedStreamSourceChannel$1.run(AbstractFramedStreamSourceChannel.java:282) at io.undertow.server.protocol.framed.AbstractFramedChannel$3.run(AbstractFramedChannel.java:231) at org.xnio.nio.WorkerThread.safeRun(WorkerThread.java:612) at org.xnio.nio.WorkerThread.run(WorkerThread.java:479) {code} The application does actually seem to work fine.