Logstash (Unable to retrieve license information from license server {:message=>"Unsupported or unrecognized SSL message"})

I am getting the following error, does anyone know what is happening?

localhost:/etc/logstash # tail -f /var/log/logstash/logstash-plain.log

[2021-06-30T16:44:31,287][ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"Unsupported or unrecognized SSL message"}
[2021-06-30T16:45:01,284][ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"Unsupported or unrecognized SSL message"}
[2021-06-30T16:45:31,284][ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"Unsupported or unrecognized SSL message"}
[2021-06-30T16:46:01,286][ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"Unsupported or unrecognized SSL message"}
[2021-06-30T16:46:31,305][ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"Unsupported or unrecognized SSL message"}
[2021-06-30T16:47:01,286][ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"Unsupported or unrecognized SSL message"}
[2021-06-30T16:47:31,282][ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"Unsupported or unrecognized SSL message"}
[2021-06-30T16:48:01,284][ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"Unsupported or unrecognized SSL message"}
[2021-06-30T16:48:31,283][ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"Unsupported or unrecognized SSL message"}
[2021-06-30T16:49:01,288][ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"Unsupported or unrecognized SSL message"}

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.