Java Jenkins VM从机与主机断开连接

我设置了一个配置，其中有一个Windows Server 2003虚拟机（VirtualBox 4.2.22，vmdk）在Windows 7主机上运行。从属代理客户端在Windows Server 2003虚拟机上运行，使用Java 1.7.0_80。在主机上，Jenkins 1.625.1 LTS与Java 1.8.0_66一起安装。在构建过程中，Jenkins从属节点将脱机：

Slave went offline during the build
ERROR: Connection was broken: java.io.EOFException
   at org.jenkinsci.remoting.nio.NioChannelHub$3.run(NioChannelHub.java:613)
   at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
   at java.util.concurrent.FutureTask.run(Unknown Source)
   at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:112)
   at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
   at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
   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 java.lang.Thread.run(Unknown Source)

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此链接是我能找到的唯一与此问题相关的链接：。有什么想法吗？

你是如何连接奴隶和主人的？哪个协议？JNLP？作为服务？您如何连接从机和主机？哪个协议？JNLP？作为服务？