Job log:
FATAL: command execution failedjava.io.EOFException at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2675) at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:3150) at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:859) at java.io.ObjectInputStream.<init>(ObjectInputStream.java:355) at hudson.remoting.ObjectInputStreamEx.<init>(ObjectInputStreamEx.java:48) at hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:34) at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:59)Caused: java.io.IOException: Unexpected termination of the channel at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:73)Caused: java.io.IOException: Backing channel 'zrh-F20-bld-14' is disconnected. at hudson.remoting.RemoteInvocationHandler.channelOrFail(RemoteInvocationHandler.java:192) at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:257) at com.sun.proxy.$Proxy58.isAlive(Unknown Source) at hudson.Launcher$RemoteLauncher$ProcImpl.isAlive(Launcher.java:1043) at hudson.Launcher$RemoteLauncher$ProcImpl.join(Launcher.java:1035) at hudson.tasks.CommandInterpreter.join(CommandInterpreter.java:155) at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:109) at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:66) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20) at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779) at hudson.model.Build$BuildExecution.build(Build.java:206) at hudson.model.Build$BuildExecution.doRun(Build.java:163) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534) at hudson.model.Run.execute(Run.java:1735) at hudson.matrix.MatrixRun.run(MatrixRun.java:146) at hudson.model.ResourceController.execute(ResourceController.java:97) at hudson.model.Executor.run(Executor.java:405)Build step 'Execute shell' marked build as failureFATAL: channel is already closedjava.io.EOFException at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2675) at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:3150) at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:859) at java.io.ObjectInputStream.<init>(ObjectInputStream.java:355) at hudson.remoting.ObjectInputStreamEx.<init>(ObjectInputStreamEx.java:48) at hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:34) at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:59)Caused: java.io.IOException: Unexpected termination of the channel at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:73)Caused: hudson.remoting.ChannelClosedException: channel is already closed at hudson.remoting.Channel.send(Channel.java:605) at hudson.remoting.Request.call(Request.java:130) at hudson.remoting.Channel.call(Channel.java:829) at hudson.Launcher$RemoteLauncher.kill(Launcher.java:984) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:540) at hudson.model.Run.execute(Run.java:1735) at hudson.matrix.MatrixRun.run(MatrixRun.java:146) at hudson.model.ResourceController.execute(ResourceController.java:97) at hudson.model.Executor.run(Executor.java:405)Finished: FAILURE

slave log on master:
[12/05/18 05:58:38] [SSH] Opening SSH connection to 10.176.225.26:22.Connection timed out (Connection timed out)SSH Connection failed with IOException: "Connection timed out (Connection timed out)".java.io.IOException: There was a problem while connecting to 10.176.225.26:22        at com.trilead.ssh2.Connection.connect(Connection.java:818)        at com.trilead.ssh2.Connection.connect(Connection.java:687)        at com.trilead.ssh2.Connection.connect(Connection.java:601)        at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:1302)        at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:814)        at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:803)        at java.util.concurrent.FutureTask.run(FutureTask.java:266)        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)        at java.lang.Thread.run(Thread.java:748)Caused by: java.net.ConnectException: Connection timed out (Connection timed out)        at java.net.PlainSocketImpl.socketConnect(Native Method)        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)        at java.net.Socket.connect(Socket.java:589)        at com.trilead.ssh2.transport.TransportManager.establishConnection(TransportManager.java:354)        at com.trilead.ssh2.transport.TransportManager.initialize(TransportManager.java:467)        at com.trilead.ssh2.Connection.connect(Connection.java:758)        ... 9 more[12/05/18 06:00:45] Launch failed - cleaning up connection[12/05/18 06:00:45] [SSH] Connection closed.

slave connection log in node:
[12/05/18 07:46:38] [SSH] Opening SSH connection to 10.176.225.26:22.Connection timed out (Connection timed out)SSH Connection failed with IOException: "Connection timed out (Connection timed out)".java.io.IOException: There was a problem while connecting to 10.176.225.26:22 at com.trilead.ssh2.Connection.connect(Connection.java:818) at com.trilead.ssh2.Connection.connect(Connection.java:687) at com.trilead.ssh2.Connection.connect(Connection.java:601) at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:1302) at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:814) at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:803) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)Caused by: java.net.ConnectException: Connection timed out (Connection timed out) at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at com.trilead.ssh2.transport.TransportManager.establishConnection(TransportManager.java:354) at com.trilead.ssh2.transport.TransportManager.initialize(TransportManager.java:467) at com.trilead.ssh2.Connection.connect(Connection.java:758) ... 9 more[12/05/18 07:48:45] Launch failed - cleaning up connection[12/05/18 07:48:45] [SSH] Connection closed.[12/05/18 08:08:38] [SSH] Opening SSH connection to 10.176.225.26:22.Connection timed out (Connection timed out)SSH Connection failed with IOException: "Connection timed out (Connection timed out)".java.io.IOException: There was a problem while connecting to 10.176.225.26:22 at com.trilead.ssh2.Connection.connect(Connection.java:818) at com.trilead.ssh2.Connection.connect(Connection.java:687) at com.trilead.ssh2.Connection.connect(Connection.java:601) at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:1302) at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:814) at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:803) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)Caused by: java.net.ConnectException: Connection timed out (Connection timed out) at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at com.trilead.ssh2.transport.TransportManager.establishConnection(TransportManager.java:354) at com.trilead.ssh2.transport.TransportManager.initialize(TransportManager.java:467) at com.trilead.ssh2.Connection.connect(Connection.java:758) ... 9 more[12/05/18 08:10:45] Launch failed - cleaning up connection[12/05/18 08:10:45] [SSH] Connection closed.