Logstash 5.1.1 can not open port

logstash 5.1.1 can not open port..
Log message is down.
How to fix it?

[2017-01-04T07:17:44,341][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:17:55,582][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:18:19,018][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:18:32,635][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:18:44,007][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:18:56,028][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:19:08,381][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:19:19,684][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:19:31,773][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:19:55,231][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:20:18,588][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:20:30,303][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:20:42,538][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:20:53,312][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:21:05,469][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:21:16,543][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:21:27,973][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:33:41,435][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2017-01-04T07:33:54,802][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}

There's nothing there to suggest there is a problem?

I solve the problem.
I use logstash-jdbc-input modul.
But, I don't have sqljdbc42.jar file in path.

jdbc_driver_library => "/lib/jdbc/sqljdbc42.jar"

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