Hi Oleg,
 
i have master jenkins server is Unix and configured slave windows VM. At the first time the slave was online and build went fine. If i starts next build the slave going offline it will never comes online.

below command i have used to launch slave from slave machine.
 
java -jar slave.jar -jnlpUrl <jenkinsmaster server url>/computer/<node name>/slave-agent.jnlp -secret <key> when i executes above command in cmd prompt i have observed below error. Sep 05, 2017 7:18:10 PM hudson.remoting.jnlp.Main$CuiListener status INFO: Handshaking Sep 05, 2017 7:18:10 PM hudson.remoting.jnlp.Main$CuiListener status INFO: Connecting to <jenkins server name>:<port> Sep 05, 2017 7:18:10 PM hudson.remoting.jnlp.Main$CuiListener status INFO: Trying protocol: JNLP4-connectit is not connecting.
Here is the log at master server.
 
Agent successfully connected and online
ERROR: Connection terminated
ESC[8mha:////4PlUa2TdwW9ojYPJb5Q+GzBDdkOY9xHSbx57494tban3AAAAWB+LCAAAAAAAAP9b85aBtbiIQSmjNKU4P08vOT+vOD8nVc8DzHWtSE4tKMnMz/PLL0ldFVf2c+b/lb5MDAwVRQxSaBqcIT
RIIQMEMIIUFgAAckCEiWAAAAA=ESC[0mjava.io.IOException: Connection reset by peer
        at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
        at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
        at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
        at sun.nio.ch.IOUtil.read(IOUtil.java:197)
        at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
        at org.jenkinsci.remoting.nio.FifoBuffer$Pointer.receive(FifoBuffer.java:142)
        at org.jenkinsci.remoting.nio.FifoBuffer.receive(FifoBuffer.java:359)
        at org.jenkinsci.remoting.nio.NioChannelHub.run(NioChannelHub.java:564)
Caused: java.io.IOException: Connection aborted: org.jenkinsci.remoting.nio.NioChannelHub$MonoNioTransport@1e1f6888[name=Channel to /172.22.180.249]
        at org.jenkinsci.remoting.nio.NioChannelHub$NioTransport.abort(NioChannelHub.java:210)
        at org.jenkinsci.remoting.nio.NioChannelHub.run(NioChannelHub.java:635)
        at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
 
Below is the slave log.
Sep 06, 2017 3:46:08 AM hudson.remoting.jnlp.Main$CuiListener status
INFO: Connecting to <jenkins master server>:<port>
Sep 06, 2017 3:46:08 AM hudson.remoting.jnlp.Main$CuiListener error
SEVERE: The server rejected the connection: None of the protocols were accepted
java.lang.Exception: The server rejected the connection: None of the protocols were accepted
at hudson.remoting.Engine.onConnectionRejected(Engine.java:286)
at hudson.remoting.Engine.run(Engine.java:262)