Inbound agent connected from 10.12.5.25
ERROR: Connection terminated
java.nio.channels.ClosedChannelException
 at jenkins.agents.WebSocketAgents$Session.closed(WebSocketAgents.java:141)
 at jenkins.websocket.WebSocketSession.onWebSocketSomething(WebSocketSession.java:91)
 at com.sun.proxy.$Proxy113.onWebSocketClose(Unknown Source)
 at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onClose(JettyListenerEventDriver.java:119)
 at org.eclipse.jetty.websocket.common.WebSocketSession.callApplicationOnClose(WebSocketSession.java:393)
 at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.disconnect(AbstractWebSocketConnection.java:317)
 at org.eclipse.jetty.websocket.common.WebSocketSession.onClosed(WebSocketSession.java:436)
 at org.eclipse.jetty.io.AbstractConnection.onClosed(AbstractConnection.java:237)
 at org.eclipse.jetty.io.AbstractConnection.onClose(AbstractConnection.java:229)
 at org.eclipse.jetty.io.ssl.SslConnection.onClose(SslConnection.java:366)
 at org.eclipse.jetty.io.SelectorManager.connectionClosed(SelectorManager.java:345)
 at org.eclipse.jetty.io.ManagedSelector$DestroyEndPoint.run(ManagedSelector.java:1062)
 at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806)
 at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938)
 at java.base/java.lang.Thread.run(Thread.java:834)

INFO: Using D:\Jenkins\remoting as a remoting work directory
Juli 08, 2020 11:46:03 VORM. org.jenkinsci.remoting.engine.WorkDirManager setupLogging
INFO: Both error and output logs will be printed to D:\Jenkins\remoting
Juli 08, 2020 11:46:05 VORM. hudson.remoting.jnlp.Main createEngine
INFO: Setting up agent: prottest08
Juli 08, 2020 11:46:05 VORM. hudson.remoting.jnlp.Main$CuiListener <init>
INFO: Jenkins agent is running in headless mode.
Juli 08, 2020 11:46:05 VORM. hudson.remoting.Engine startEngine
INFO: Using Remoting version: 4.3
Juli 08, 2020 11:46:05 VORM. org.jenkinsci.remoting.engine.WorkDirManager initializeWorkDir
INFO: Using D:\Jenkins\remoting as a remoting work directory
Juli 08, 2020 11:46:37 VORM. hudson.remoting.jnlp.Main$CuiListener error
SEVERE: Handshake response not received.
io.jenkins.remoting.shaded.javax.websocket.DeploymentException: Handshake response not received.
 at io.jenkins.remoting.shaded.org.glassfish.tyrus.client.ClientManager$3$1.run(ClientManager.java:694)
 at io.jenkins.remoting.shaded.org.glassfish.tyrus.client.ClientManager$3.run(ClientManager.java:712)
 at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
 at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
 at io.jenkins.remoting.shaded.org.glassfish.tyrus.client.ClientManager$SameThreadExecutorService.execute(ClientManager.java:866)
 at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:118)
 at io.jenkins.remoting.shaded.org.glassfish.tyrus.client.ClientManager.connectToServer(ClientManager.java:511)
 at io.jenkins.remoting.shaded.org.glassfish.tyrus.client.ClientManager.connectToServer(ClientManager.java:355)
 at hudson.remoting.Engine.runWebSocket(Engine.java:627)
 at hudson.remoting.Engine.run(Engine.java:469)