Getting "Invalid Frame Type, received: 1" on 6.2.1 stack

I'm running out of ideas. Having the 6.2.1 stack installed (ES, Logstash, Kibana and X-Pack). As soon, as I start Filebeat on a host in order to forward syslog messages to the ELK stack, I do get

Caused by:$InvalidFrameProtocolException: Invalid Frame Type, received: 1

errors in logstash logs.

I've disabled TLS. I've disabled filters. So the logstash config is down to the bare minimum:

input {
  beats {
    port => 5044
    #ssl => true
    #ssl_certificate => "/etc/pki/tls/certs/logstash-forwarder.crt"
    #ssl_key => "/etc/pki/tls/private/logstash-forwarder.key"

output {
  elasticsearch {
    hosts => "localhost:9200"
    manage_template => false
    index => "%{[@metadata][beat]}-%{[@metadata][version]}-%{+YYYY.MM.dd}"
    user => filebeat_internal
    password => ***

Any help is greatly appreciated.

What does your Filebeat configuration look like?

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