Logstash messages are not appearing in Graylog

I am going to use logstash for parsing messages so as graylog functionality is not enough for me.
But when i added logstash gelf outpu and UDP GELF input on Graylog side then nothing is happening.
All ports are opened on firewall and everything works fine if use fluentd. Messages are appearing in graylog.
But fluentd functionality is not enough for parsing logs that is why i am forced to use logstash.
Please advise how to find a root cause?
Logstash log file is ok and service is up and running.

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