My projects run on separate slave machines/nodes.
Some of these projects have testcases that change the system clock.
This causes Jenkins and the slave to immediately disconnect. It always happens.

I've tried to dig into it a bit and here's what I have:
I'm looking at hudson.remoting.PingThread.java
The timeout on the channel ping is enforced by calculating the difference between 2 counter values, each obtained with System.currentTimeMillis().
However System.currentTimeMillis() is not the right way of obtaining such counters - the values are not monotonically increasing.
If wall-clock time changes for any reason (like maybe Daylight savings or a manual change) then the value returned might become smaller than a moment ago.
Obtaining the counter values with System.nanoTime() would solve this.

STACK TRACE below:

FATAL: Unable to delete script file C:\WINDOWS\TEMP\hudson2959765976006672203.bat
00:44:00 hudson.util.IOException2: remote file operation failed: C:\WINDOWS\TEMP\hudson2959765976006672203.bat at hudson.remoting.Channel@62ec4e:UTM-RT5AUTOM027
00:44:00 at hudson.FilePath.act(FilePath.java:901)
00:44:00 at hudson.FilePath.act(FilePath.java:878)
00:44:00 at hudson.FilePath.delete(FilePath.java:1263)
00:44:00 at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:101)
00:44:00 at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:60)
00:44:00 at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
00:44:00 at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:802)
00:44:00 at hudson.model.Build$BuildExecution.build(Build.java:199)
00:44:00 at hudson.model.Build$BuildExecution.doRun(Build.java:160)
00:44:00 at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:584)
00:44:00 at hudson.model.Run.execute(Run.java:1592)
00:44:00 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
00:44:00 at hudson.model.ResourceController.execute(ResourceController.java:88)
00:44:00 at hudson.model.Executor.run(Executor.java:237)
00:44:00 Caused by: hudson.remoting.ChannelClosedException: channel is already closed
00:44:00 at hudson.remoting.Channel.send(Channel.java:494)
00:44:00 at hudson.remoting.Request.call(Request.java:129)
00:44:00 at hudson.remoting.Channel.call(Channel.java:672)
00:44:00 at hudson.FilePath.act(FilePath.java:894)
00:44:00 ... 13 more
00:44:00 Caused by: java.io.IOException: Unexpected termination of the channel
00:44:00 at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:50)
00:44:00 Caused by: java.io.EOFException
00:44:00 at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2554)
00:44:00 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1297)
00:44:00 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
00:44:00 at hudson.remoting.Command.readFrom(Command.java:92)
00:44:00 at hudson.remoting.ClassicCommandTransport.read(ClassicCommandTransport.java:59)
00:44:00 at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:48)
00:44:00 FATAL: hudson.remoting.RequestAbortedException: java.io.IOException: Unexpected termination of the channel
00:44:00 hudson.remoting.RequestAbortedException: hudson.remoting.RequestAbortedException: java.io.IOException: Unexpected termination of the channel
00:44:00 at hudson.remoting.Request.call(Request.java:174)
00:44:00 at hudson.remoting.Channel.call(Channel.java:672)
00:44:00 at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:158)
00:44:00 at $Proxy45.join(Unknown Source)
00:44:00 at hudson.Launcher$RemoteLauncher$ProcImpl.join(Launcher.java:925)
00:44:00 at hudson.Launcher$ProcStarter.join(Launcher.java:360)
00:44:00 at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:91)
00:44:00 at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:60)
00:44:00 at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
00:44:00 at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:802)
00:44:00 at hudson.model.Build$BuildExecution.build(Build.java:199)
00:44:00 at hudson.model.Build$BuildExecution.doRun(Build.java:160)
00:44:00 at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:584)
00:44:00 at hudson.model.Run.execute(Run.java:1592)
00:44:00 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
00:44:00 at hudson.model.ResourceController.execute(ResourceController.java:88)
00:44:00 at hudson.model.Executor.run(Executor.java:237)
00:44:00 Caused by: hudson.remoting.RequestAbortedException: java.io.IOException: Unexpected termination of the channel
00:44:00 at hudson.remoting.Request.abort(Request.java:299)
00:44:00 at hudson.remoting.Channel.terminate(Channel.java:732)
00:44:00 at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:69)
00:44:00 Caused by: java.io.IOException: Unexpected termination of the channel
00:44:00 at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:50)
00:44:00 Caused by: java.io.EOFException
00:44:00 at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2554)
00:44:00 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1297)
00:44:00 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
00:44:00 at hudson.remoting.Command.readFrom(Command.java:92)
00:44:00 at hudson.remoting.ClassicCommandTransport.read(ClassicCommandTransport.java:59)
00:44:00 at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:48)