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Looks like a regression, or sporadic issue. I'm experiencing this now.
In our environment, ubuntu master, windows slaves.
Jenkins: 1.572 slave.jar version: 2.43 (the version on the master)
java.io.IOException: NioChannelHub is not currently running
at org.jenkinsci.remoting.nio.NioChannelHub$1.makeTransport(NioChannelHub.java:446)
at hudson.remoting.ChannelBuilder.negotiate(ChannelBuilder.java:220)
at hudson.remoting.ChannelBuilder.build(ChannelBuilder.java:149)
at hudson.remoting.ChannelBuilder.build(ChannelBuilder.java:159)
at org.jenkinsci.remoting.nio.NioChannelBuilder.build(NioChannelBuilder.java:36)
at org.jenkinsci.remoting.nio.NioChannelBuilder.build(NioChannelBuilder.java:52)
at jenkins.slaves.JnlpSlaveAgentProtocol$Handler.jnlpConnect(JnlpSlaveAgentProtocol.java:120)
at jenkins.slaves.DefaultJnlpSlaveReceiver.handle(DefaultJnlpSlaveReceiver.java:63)
at jenkins.slaves.JnlpSlaveAgentProtocol2$Handler2.run(JnlpSlaveAgentProtocol2.java:57)
at jenkins.slaves.JnlpSlaveAgentProtocol2.handle(JnlpSlaveAgentProtocol2.java:31)
at hudson.TcpSlaveAgentListener$ConnectionHandler.run(TcpSlaveAgentListener.java:157)
In our environment slaves get disconnected after a suite of tests complete (and revert to a clean vSphere snapshot) and then reconnect.
It runs fine for a while, with many disconnects/reconnects.
Then starts tossing these exceptions and nothing can connect until a restart.