DSE won't start because cannot bind to port 8609 – DataStax Support

In rare occasions, DSE will fail to start with the following exception on system.log:

INFO  [main] 2018-06-07 05:32:27,547  LeaseProtocol.java:92 - Registered LeaseProtocol 
INFO  [main] 2018-06-07 05:32:27,551  InternalQueryRouterProtocol.java:53 - Registered InternalQueryRouterProtocol 
INFO  [main] 2018-06-07 05:32:28,647  RemoteMessageServer.java:76 - Starting internode-messaging internal message server on [/10.200.43.10]:8609 
ERROR [main] 2018-06-07 05:32:28,719  CassandraDaemon.java:709 - Exception encountered during startup java.net.BindException: Address already in use
         at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_144]
         at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_144]
         at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_144]
         at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_144]
         at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_144]
         at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:125) ~[netty-all-4.0.34.Final.jar:4.0.34.Final]
         at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:485) ~[netty-all-4.0.34.Final.jar:4.0.34.Final]
         at io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1094) ~[netty-all-4.0.34.Final.jar:4.0.34.Final]
         at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:428) ~[netty-all-4.0.34.Final.jar:4.0.34.Final]
         at io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:414) ~[netty-all-4.0.34.Final.jar:4.0.34.Final]
         at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:897) ~[netty-all-4.0.34.Final.jar:4.0.34.Final]
         at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:198) ~[netty-all-4.0.34.Final.jar:4.0.34.Final
         at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:349) ~[netty-all-4.0.34.Final.jar:4.0.34.Final
         at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:358) ~[netty-all-4.0.34.Final.jar:4.0.34.Final]
         at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357) ~[netty-all-4.0.34.Final.jar:4.0.34.Final]
         at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112) ~[netty-all-4.0.34.Final.jar:4.0.34.Final]
         at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137) ~[netty-all-4.0.34.Final.jar:4.0.34.Final]
         at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_144]

The problem stems from DSE Search not being able to bind to port 8609 for inter-node communications.

Execute the following commands to free the socket

sudo service dse stop
sudo kill -9 $(sudo lsof -i :8609 | awk '!/PID/ {print $2}' | sort -u)
sudo service dse start
Try restarting DSE
Should that still not work, try rebooting the node
If DSE still refuses to start with the same error to bind to port 8609, follow these recommendations from redhat for port 8906

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