Netty network issue

gistfile1.txt

INFO  [epollEventLoopGroup-2-6] 2018-08-26 11:33:10,003 Message.java:623 - Unexpected exception during request; channel = [id: 0xf72d6e2f, L:/10.233.66.7:9042 - R:/10.233.65.7:48742]
io.netty.channel.unix.Errors$NativeIoException: readAddress() failed: Connection timed out
        at io.netty.channel.unix.Errors.newIOException(Errors.java:117) ~[netty-all-4.0.44.Final.jar:4.0.44.Final]
        at io.netty.channel.unix.Errors.ioResult(Errors.java:138) ~[netty-all-4.0.44.Final.jar:4.0.44.Final]
        at io.netty.channel.unix.FileDescriptor.readAddress(FileDescriptor.java:175) ~[netty-all-4.0.44.Final.jar:4.0.44.Final]
        at io.netty.channel.epoll.AbstractEpollChannel.doReadBytes(AbstractEpollChannel.java:238) ~[netty-all-4.0.44.Final.jar:4.0.44.Final]
        at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:926) ~[netty-all-4.0.44.Final.jar:4.0.44.Final]
        at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:397) [netty-all-4.0.44.Final.jar:4.0.44.Final]
        at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:302) [netty-all-4.0.44.Final.jar:4.0.44.Final]
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:131) [netty-all-4.0.44.Final.jar:4.0.44.Final]
        at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144) [netty-all-4.0.44.Final.jar:4.0.44.Final]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_171]