Is it a service restart or a system restart? in the latter case I would suggest to enable the delayed start mode or to configure dependencies on the remote auth services. See the documentation here: https://github.com/kohsuke/winsw

It is a Jenkins restart (e.g. /saferestart ) or the automatic restart after upgrading plugins or Jenkins version. I face no issues, if I restart the service or reboot the computer.

Please let me know if I can provide any more info for this issue?

Which version of WinSW do you use on the master just in case?

Please forgive me because I do not understand the question. This is my best shot: The server OS is given in the "Environment" section, if I look for "winsw" in the /systemInfo the only match is WINSW_EXECUTABLE D:\Jenkins\jenkins.exe - which is also given in the "Environment" section. I used the "winsw" label, because at first I attached this issue to the comments on another issue and was asked to create a new issue instead - I do not know what "winsw" means. I've searched for "winsw*.*" on the master in the Jenkins directory and the user running the service - but found nothing

jenkins.exe is a renamed WinSW executable. Just send me it's version (it is available in assembly info for the Exe file)

Details for jenkins.exe are: File version = Product version = 1.1.0.0 Date modified = 10-05-2015 17:43

This is the old version.

Please download new executable from https://github.com/kohsuke/winsw#download , replace jenkins.exe, and then trye again.

Details for jenkins.exe now are:
File version = 2.1.2.0
Product version = 2.1.2
Date modified = 16-08-2017 17:02
Original filename WindowsService.exe

(I stopped the Jenkins service, renamed .exe files, restarted Jenkins, used the "Update automatic" to 2.74, restart when no jobs... Jenkins stopped allright, but did not restart. From the "jenkins.wrapper.log":

2017-08-16 17:06:25 - Stopping jenkins
2017-08-16 17:06:25 - ProcessKill 5108
2017-08-16 17:06:26 - Send SIGINT 5108
2017-08-16 17:06:26 - SIGINT to5108 successful
2017-08-16 17:06:26 - Finished jenkins
2017-08-16 17:07:16,881 INFO - Starting ServiceWrapper in the service mode
2017-08-16 17:07:17,084 INFO - Starting D:\Jenkins\jre\bin\java -Xrs -Xmx1024m -Dhudson.model.DirectoryBrowserSupport.CSP -Dhudson.lifecycle=hudson.lifecycle.WindowsServiceLifecycle -jar "D:\Jenkins\jenkins.war" --httpPort=8080
2017-08-16 17:07:17,084 INFO - Starting D:\Jenkins\jre\bin\java -Xrs -Xmx1024m -Dhudson.model.DirectoryBrowserSupport.CSP -Dhudson.lifecycle=hudson.lifecycle.WindowsServiceLifecycle -jar "D:\Jenkins\jenkins.war" --httpPort=8080
2017-08-16 17:07:17,193 INFO - Started process 1804
2017-08-16 17:07:17,209 DEBUG - Forwarding logs of the process System.Diagnostics.Process (java) to winsw.SizeBasedRollingLogAppender
2017-08-16 17:09:37,108 DEBUG - Starting ServiceWrapper in the CLI mode
2017-08-16 17:09:37,578 INFO - Restarting the service with id 'jenkins'
2017-08-16 17:09:37,613 DEBUG - Completed. Exit code is 0
2017-08-16 17:09:38,085 DEBUG - Starting ServiceWrapper in the CLI mode
2017-08-16 17:09:38,569 INFO - Restarting the service with id 'jenkins'
2017-08-16 17:09:38,619 FATAL - WMI Operation failure: AccessDenied
WMI.WmiException: AccessDenied
at WMI.WmiRoot.InstanceHandler.Invoke(Object proxy, MethodInfo method, Object[] args)
at winsw.WrapperService.Run(String[] _args, ServiceDescriptor descriptor)
at winsw.WrapperService.Main(String[] args)

From the jenkins.err.log:

INFO: Restart in 10 seconds
aug. 16, 2017 5:09:34 PM jenkins.model.Jenkins$26 run
SEVERE: Restarting VM as requested by nkj
aug. 16, 2017 5:09:34 PM jenkins.model.Jenkins cleanUp
INFO: Stopping Jenkins
aug. 16, 2017 5:09:34 PM jenkins.model.Jenkins$21 onAttained
INFO: Started termination
aug. 16, 2017 5:09:34 PM jenkins.model.Jenkins$21 onAttained
INFO: Completed termination
aug. 16, 2017 5:09:34 PM jenkins.model.Jenkins _cleanUpDisconnectComputers
INFO: Starting node disconnection
aug. 16, 2017 5:09:34 PM jenkins.slaves.DefaultJnlpSlaveReceiver channelClosed
WARNING: safe-restart thread for EAC3 Win10 (dtdkcphpw200044) terminated
java.nio.channels.ClosedChannelException
at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer.onReadClosed(ChannelApplicationLayer.java:208)
at org.jenkinsci.remoting.protocol.ApplicationLayer.onRecvClosed(ApplicationLayer.java:222)
at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:832)
at org.jenkinsci.remoting.protocol.FilterLayer.onRecvClosed(FilterLayer.java:287)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.onRecvClosed(SSLEngineFilterLayer.java:181)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.switchToNoSecure(SSLEngineFilterLayer.java:283)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processWrite(SSLEngineFilterLayer.java:503)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processQueuedWrites(SSLEngineFilterLayer.java:248)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.doSend(SSLEngineFilterLayer.java:200)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.doCloseSend(SSLEngineFilterLayer.java:213)
at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.doCloseSend(ProtocolStack.java:800)
at org.jenkinsci.remoting.protocol.ApplicationLayer.doCloseWrite(ApplicationLayer.java:173)
at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer$ByteBufferCommandTransport.closeWrite(ChannelApplicationLayer.java:311)
at hudson.remoting.Channel.close(Channel.java:1304)
at hudson.remoting.Channel.close(Channel.java:1272)
at hudson.slaves.SlaveComputer.closeChannel(SlaveComputer.java:708)
at hudson.slaves.SlaveComputer.kill(SlaveComputer.java:675)
at hudson.model.AbstractCIBase.killComputer(AbstractCIBase.java:88)
at jenkins.model.Jenkins.access$2000(Jenkins.java:307)
at jenkins.model.Jenkins$22.run(Jenkins.java:3370)
at hudson.model.Queue._withLock(Queue.java:1338)
at hudson.model.Queue.withLock(Queue.java:1215)
at jenkins.model.Jenkins._cleanUpDisconnectComputers(Jenkins.java:3364)
at jenkins.model.Jenkins.cleanUp(Jenkins.java:3240)
at hudson.lifecycle.WindowsServiceLifecycle.restart(WindowsServiceLifecycle.java:123)
at jenkins.model.Jenkins$26.run(Jenkins.java:4225)

aug. 16, 2017 5:09:34 PM jenkins.slaves.DefaultJnlpSlaveReceiver channelClosed
WARNING: safe-restart thread for LDC Win10 on own VM (dtdkcphvm200040) terminated
java.nio.channels.ClosedChannelException
at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer.onReadClosed(ChannelApplicationLayer.java:208)
at org.jenkinsci.remoting.protocol.ApplicationLayer.onRecvClosed(ApplicationLayer.java:222)
at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:832)
at org.jenkinsci.remoting.protocol.FilterLayer.onRecvClosed(FilterLayer.java:287)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.onRecvClosed(SSLEngineFilterLayer.java:181)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.switchToNoSecure(SSLEngineFilterLayer.java:283)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processWrite(SSLEngineFilterLayer.java:503)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processQueuedWrites(SSLEngineFilterLayer.java:248)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.doSend(SSLEngineFilterLayer.java:200)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.doCloseSend(SSLEngineFilterLayer.java:213)
at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.doCloseSend(ProtocolStack.java:800)
at org.jenkinsci.remoting.protocol.ApplicationLayer.doCloseWrite(ApplicationLayer.java:173)
at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer$ByteBufferCommandTransport.closeWrite(ChannelApplicationLayer.java:311)
at hudson.remoting.Channel.close(Channel.java:1304)
at hudson.remoting.Channel.close(Channel.java:1272)
at hudson.slaves.SlaveComputer.closeChannel(SlaveComputer.java:708)
at hudson.slaves.SlaveComputer.kill(SlaveComputer.java:675)
at hudson.model.AbstractCIBase.killComputer(AbstractCIBase.java:88)
at jenkins.model.Jenkins.access$2000(Jenkins.java:307)
at jenkins.model.Jenkins$22.run(Jenkins.java:3370)
at hudson.model.Queue._withLock(Queue.java:1338)
at hudson.model.Queue.withLock(Queue.java:1215)
at jenkins.model.Jenkins._cleanUpDisconnectComputers(Jenkins.java:3364)
at jenkins.model.Jenkins.cleanUp(Jenkins.java:3240)
at hudson.lifecycle.WindowsServiceLifecycle.restart(WindowsServiceLifecycle.java:123)
at jenkins.model.Jenkins$26.run(Jenkins.java:4225)

aug. 16, 2017 5:09:34 PM jenkins.model.Jenkins _cleanUpShutdownPluginManager
INFO: Stopping plugin manager
aug. 16, 2017 5:09:34 PM hudson.plugins.sshslaves.PluginImpl closeRegisteredConnections
INFO: Forcing connection to dtdkcphpw200040:22 closed.
aug. 16, 2017 5:09:34 PM hudson.plugins.sshslaves.PluginImpl closeRegisteredConnections
INFO: Forcing connection to DTDKCPHAS1060:22 closed.
aug. 16, 2017 5:09:34 PM hudson.plugins.sshslaves.PluginImpl closeRegisteredConnections
INFO: Forcing connection to mddkcphpw106024:22 closed.
aug. 16, 2017 5:09:34 PM jenkins.model.Jenkins _cleanUpPersistQueue
INFO: Persisting build queue
aug. 16, 2017 5:09:34 PM jenkins.model.Jenkins _cleanUpAwaitDisconnects
INFO: Waiting for node disconnection completion
aug. 16, 2017 5:09:36 PM jenkins.model.Jenkins cleanUp
INFO: Jenkins stopped
aug. 16, 2017 5:10:33 PM net.bull.javamelody.internal.common.JavaLogger warn
WARNING: exception while collecting data
java.util.concurrent.ExecutionException: java.io.IOException: Cannot locate RemoteClassLoader.ClassLoaderProxy(7) in the channel exported table
at hudson.remoting.Channel$2.adapt(Channel.java:871)
at hudson.remoting.Channel$2.adapt(Channel.java:866)
at hudson.remoting.FutureAdapter.get(FutureAdapter.java:59)
at net.bull.javamelody.RemoteCallHelper.collectDataByNodeName(RemoteCallHelper.java:178)
at net.bull.javamelody.RemoteCallHelper.collectJavaInformationsListByName(RemoteCallHelper.java:188)
at net.bull.javamelody.NodesCollector.collectWithoutErrorsNow(NodesCollector.java:159)
at net.bull.javamelody.NodesCollector.collectWithoutErrors(NodesCollector.java:147)
at net.bull.javamelody.NodesCollector$2.run(NodesCollector.java:115)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
Caused by: java.io.IOException: Cannot locate RemoteClassLoader.ClassLoaderProxy(7) in the channel exported table
at hudson.remoting.MultiClassLoaderSerializer$Input.readClassLoader(MultiClassLoaderSerializer.java:103)
at hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(MultiClassLoaderSerializer.java:124)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at hudson.remoting.UserRequest.deserialize(UserRequest.java:245)
at hudson.remoting.UserResponse.retrieve(UserRequest.java:278)
at hudson.remoting.Channel$2.adapt(Channel.java:869)
... 9 more
Caused by: java.util.concurrent.ExecutionException: Invalid object ID 7 iota=8
at hudson.remoting.ExportTable.diagnoseInvalidObjectId(ExportTable.java:473)
at hudson.remoting.ExportTable.get(ExportTable.java:394)
at hudson.remoting.Channel.getExportedObject(Channel.java:675)
at hudson.remoting.MultiClassLoaderSerializer$Input.readClassLoader(MultiClassLoaderSerializer.java:101)
... 18 more

I then restarted the service using the "Services" dialog and Jenkins 2.74 woke up just fine.

I just updated to 2.75, the same issue persists: The automatic restart closes Jenkins alright, but it never restarts. A manual restart from the "Services" dialog makes it run again.

Under which account do you run the Windows service wrapper? Seems there is a security issue with WMI somewhere. It would be also useful to check Security/System/Application event logs at the issue timeframe, maybe there are more details.

2017-08-16 17:09:38,619 FATAL - WMI Operation failure: AccessDenied
WMI.WmiException: AccessDenied
at WMI.WmiRoot.InstanceHandler.Invoke(Object proxy, MethodInfo method, Object[] args)
at winsw.WrapperService.Run(String[] _args, ServiceDescriptor descriptor)
at winsw.WrapperService.Main(String[] args)

I tried to clear all 3 logs and then I used the "safeRestart" command. Application log : 0 entries, System: 1 entry (The System log file was cleared.), Security log file: (Perhaps not relevant):

Service:
Server: NT Local Security Authority / Authentication Service
Service Name: LsaRegisterLogonProcess()

Process:
Process ID: 0x32c
Process Name: C:\Windows\System32\lsass.exe

Service Request Information:
Privileges: SeTcbPrivilege

Then I cleared the logs again and used "Restart" from the Services dialog. The Application log shows that Jenkins starts twice, failing on the first attempt with errorcode 1.

The Security log shows that Jenkins uses "Special Logon" with SeImpersonatePrivilege - twice.

And finally, the System log shows that Jenkins stops, then starts, then "terminated unexpectedly". The corrective action (Restart) happens after a timeout (120.000 ms). This time around, it just wakes up, no issues.

I've just updated to 2.77 and I hoped that the change about JENKINS_HOME had fixed it (https://issues.jenkins-ci.org/browse/JENKINS-13153) - but no. /SafeRestart still hangs.

A comment to another similar issue indicated that "Windows Management Instrumentation" (WMI) needs to become a "dependency" (? ) of the Jenkins service. Not a Windows user, but perhaps this means something to you nkjensen

https://issues.jenkins-ci.org/browse/JENKINS-2566?focusedCommentId=147780&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-147780

The problem was resolved "outside" Jenkins. The user running the Jenkins service (Log-in As) had more rights:

I created a job, which simply reboots the server weekly. The user running the Jenkins service was not allowed to "shutdown" the server. IT dept granted the "shutdown" right to the user running the Jenkins service - and somehow this also "fixed" the problem of restarting the Jenkins service after a SW or Plugin upgrade.

I'll set this issue to "Fixed"

The issue is a user-rights issue. The user running the server needs to be granted the right to "shutdown" system.

Hi,

I have a similar issue. Can someone guide me about possible fix ?

OS - windows 2012 R2 (both Master and Slave)

Java - 1.8.0_211 (both Mater and Salve)

Jenkins Version - 2.176.2Slave

Launch Method - Java Web start, JNLP(Launch by connecting it to the Master)

Issue - I have a project in Jenkins which fails mainly because the slave terminates after 'Starting ServiceWrapper in the CLI mode' during execution.Finds a child process conhost.exe and failed due to Killing as fallback.

This is happening only for a project/ pipeline, where I have python script which pings a internal URL (https://URL/ping), invokes the network emulator tool installed, adjust the network latency and also write to a file/ push to ELK. I have a internet proxy set up using .pac file. 

It completes all the steps in project, at the end the slave terminates, marking the build as failure 

Note - We also have another old version of jenkins 2.76 installed where the same project/ pipeline works with out any issue. Now we want to upgrade to latest jenkins but facing issue with slave getting terminated. I now have to close the network emulator tool every time and restart the jenkins service to bring it back online. 

Error as obsreved in Jenkins-slave.wrapper.log:-

2019-07-24 03:51:59,751 INFO  - Stopping jenkinsslave-e__jenkins
2019-07-24 03:51:59,751 DEBUG - ProcessKill 6872
2019-07-24 03:51:59,860 INFO  - Found child process: 6408 Name: conhost.exe
2019-07-24 03:51:59,892 INFO  - Stopping process 6408
2019-07-24 03:51:59,907 INFO  - Send SIGINT 6408
2019-07-24 03:51:59,907 WARN  - SIGINT to 6408 failed - Killing as fallback
2019-07-24 03:51:59,907 INFO  - Stopping process 6872
2019-07-24 03:51:59,907 INFO  - Send SIGINT 6872
2019-07-24 03:51:59,907 WARN  - SIGINT to 6872 failed - Killing as fallback
2019-07-24 03:51:59,907 INFO  - Finished jenkinsslave-e__jenkins
2019-07-24 03:51:59,907 DEBUG - Completed. Exit code is 0

Error as obsreved in jenkins-slave.error.log:-
Jul 24, 2019 3:57:23 AM hudson.remoting.jnlp.Main$CuiListener statusJul
24, 2019 3:57:23 AM hudson.remoting.jnlp.Main$CuiListener statusINFO: Terminated
Jul 24, 2019 3:57:23 AM hudson.util.ProcessTree getWARNING: Error while determining if vetoers existhudson.remoting.RequestAbortedException: java.nio.channels.ClosedChannelException
at hudson.remoting.Request.abort(Request.java:340) at hudson.remoting.Channel.terminate(Channel.java:1040)
at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer.onReadClosed(ChannelApplicationLayer.java:209)
at org.jenkinsci.remoting.protocol.ApplicationLayer.onRecvClosed(ApplicationLayer.java:222)
at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:816)
at org.jenkinsci.remoting.protocol.FilterLayer.onRecvClosed(FilterLayer.java:287)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.onRecvClosed(SSLEngineFilterLayer.java:172)
at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:816)
at org.jenkinsci.remoting.protocol.NetworkLayer.onRecvClosed(NetworkLayer.java:154)
at org.jenkinsci.remoting.protocol.impl.BIONetworkLayer.access$1800(BIONetworkLayer.java:48)
at org.jenkinsci.remoting.protocol.impl.BIONetworkLayer$Reader.run(BIONetworkLayer.java:264)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at hudson.remoting.Engine$1.lambda$newThread$0(Engine.java:93)
at java.lang.Thread.run(Unknown Source) Suppressed: hudson.remoting.Channel$CallSiteStackTrace: Remote call to JNLP4-connect connection to jenkinsmater/IP address:33131
at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1743)
at hudson.remoting.Request.call(Request.java:202) at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:286)
at com.sun.proxy.$Proxy6.fetch3(Unknown Source)
at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:209)
at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source) at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:383) at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:307)
at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source) at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:383) at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:307)
at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source) at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:383) at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:307)
at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source)
at hudson.util.ProcessTree.get(ProcessTree.java:415)
at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1103) at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1094)
at hudson.remoting.UserRequest.perform(UserRequest.java:212)
at hudson.remoting.UserRequest.perform(UserRequest.java:54) at hudson.remoting.Request$2.run(Request.java:369)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask.run(Unknown Source) ... 4 moreCaused by: java.nio.channels.ClosedChannelException ... 7 more
Jul 24, 2019 3:57:23 AM hudson.util.ProcessTree getWARNING: Failed to load winp. Reverting to the defaultjava.lang.NoClassDefFoundError: hudson/util/ProcessTree$WindowsOSProcessException
at hudson.util.ProcessTree.get(ProcessTree.java:430)
at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1103) at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1094)
at hudson.remoting.UserRequest.perform(UserRequest.java:212)
at hudson.remoting.UserRequest.perform(UserRequest.java:54) at hudson.remoting.Request$2.run(Request.java:369)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at hudson.remoting.Engine$1.lambda$newThread$0(Engine.java:93)
at java.lang.Thread.run(Unknown Source)Caused by: java.lang.ClassNotFoundException: hudson.util.ProcessTree$WindowsOSProcessException at java.net.URLClassLoader.findClass(Unknown Source)
at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:171) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 12 more
Jul 24, 2019 3:57:23 AM hudson.remoting.Request$2 runINFO: Failed to send back a reply to the request hudson.remoting.Request$2@626d990c: hudson.remoting.ChannelClosedException: Channel "hudson.remoting.Channel@4d834d1e:JNLP4-connect connection to jenkinsmaster/IP Address:33131": channel is already closed

Jul 24, 2019 3:57:33 AM hudson.remoting.jnlp.Main$CuiListener statusINFO: Performing onReconnect operation.

Can someone please help with this issue ?

Thanks,

Chethan

Have you tried the fixes mentioned here:

https://issues.jenkins.io/browse/JENKINS-55945?focusedCommentId=403214&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-403214