Port 9200 (TCP) — Elasticsearch

Elasticsearch REST API.

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Check if port 9200 is open

On the server, see what is listening:

sudo ss -tulpn | grep ':9200 '

From another machine, test reachability:

nc -zv your-server.example.com 9200

With UFW (Ubuntu/Debian):

sudo ufw deny 9200

With firewalld (RHEL/AlmaLinux/Rocky):

sudo firewall-cmd --permanent --remove-port=9200/tcp && sudo firewall-cmd --reload