This happened intermittently (low frequency).

[2018-02-25 06:47:55,981] Agent[42]: stderr: java.net.ConnectException: Connection refused: connect
[2018-02-25 06:47:55,981] Agent[42]: stderr: at java.base/java.net.DualStackPlainSocketImpl.connect0(Native Method)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at java.base/java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:403)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:246)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:228)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at java.base/java.net.PlainSocketImpl.connect(PlainSocketImpl.java:148)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:402)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at java.base/java.net.Socket.connect(Socket.java:591)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at java.base/java.net.Socket.connect(Socket.java:540)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at java.base/java.net.Socket.<init>(Socket.java:436)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at java.base/java.net.Socket.<init>(Socket.java:246)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at com.sun.javatest.regtest.agent.AgentServer.<init>(AgentServer.java:153)
[2018-02-25 06:47:55,981] Agent[42]: stderr: at com.sun.javatest.regtest.agent.AgentServer.main(AgentServer.java:59)