詹金斯升级后无法到达节点

我刚刚将詹金斯从2.39升级到2.57。升级后，Jenkins无法再与我的SSH构建节点通信。我收到以下错误：

<===[JENKINS REMOTING CAPACITY]===>channel started
Slave JVM has not reported exit code. Is it still running?
[04/28/17 01:29:32] Launch failed - cleaning up connection
[04/28/17 01:29:32] [SSH] Connection closed.
ERROR: Connection terminated
java.io.EOFException
    at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2335)
    at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2804)
    at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:802)
    at java.io.ObjectInputStream.<init>(ObjectInputStream.java:299)
    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)

基于谷歌搜索'从JVM尚未报告退出代码。似乎是Java版本不匹配（JENKINS-30561，JENKINS-29120），但是我可以确认我的构建节点使用的是Java 1.7：

$ java -version
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)

是否有人想法可能是什么原因造成的？可根据要求提供更多信息。