Hi Noémi Ványi,
Thanks for the update.
Kindly correct me if my understanding wrong.
ELK Stack components ElasticSearch+Kibana and syslog-ng installed on host server(centralized log server) runs on Red Hat Linux.
Remote Host(client application) runs on Windows for Log collection,installed Winlogbeat only.
kibana & elasticsearch host IP-10.81.162.251
Kindly take a look winlogbeat.yml for your review.
###################### Winlogbeat Configuration Example ########################