I have a cluster consisting of 3 nodes and an installation of kibana and logstash, all to version 6.8.1.
I followed the procedure to configure SSL, TLS and HTTPS certificates:
The Elasticsearch nodes are working, Kibana is working, Logstash has this error at startup:
[ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"Unrecognized SSL message, plaintext connection?"}
[ERROR][logstash.monitoring.internalpipelinesource] Failed to fetch X-Pack information from Elasticsearch. This is likely due to failure to reach a live Elasticsearch cluster.
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