Don't understand WRONG_VERSION_NUMBER errors

I'm receiving in my logstash output
[2018-09-19T13:21:01,280][INFO ][] [local:, remote: undefined] Handling exception: error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER
It's filebeat input, setup as:
input { beats { port => 5044 client_inactivity_timeout => 300 ssl => true ssl_certificate_authorities => ["/etc/logstash/zethconca.pem"] ssl_certificate => "/etc/logstash/logstash.pem" ssl_key => "/etc/logstash/logstash.pk8" ssl_verify_mode => "peer" } }
The certs were created by openssl using the standard methods used all over the web. What exactly does this mean? There are no beats talking to the server yet, it's just standalone getting ready to start testing. 6.4.1. Any clue?

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