I installed Elastic, Kibana and Heartbeat as instructed. All 7.4, Ubuntu 18.04 and all working fine.
With Filebeat, on another Ubuntu I installed Filebeat and this is can't connect to Elastic: "Connection refused". There are many posts on the internet, any old. I tried network.host: 0.0.0.0, but then Elastic won't (re)start.
It's all internal network.
Thanks for help!