Filebeat Fail to get Kibana Version > x509: certificate signed by unknown authority

Hello!

I have set up basic Elastic+Kibana setup and I`m trying to get Filebeat up and running on the server.
I have configured it as from quick start guide, but I get this error:

Exiting: error connecting to Kibana: fail to get the Kibana version: HTTP GET request to https://10.20.20.30:5601/api/status fails: fail to execute the HTTP GET request: Get "https://10.20.20.30:5601/api/status": x509: certificate signed by unknown authority. Response:

I`m not sure where to start - could you please guide me how to tackle this problem?