Port 9200 — Elasticsearch

Security guidance

Open Elasticsearch clusters have caused some of the largest data leaks on record. Never expose it.

Test port 9200 yourself

From your own machine, against any host (swap in your domain):

macOS / Linux — netcat

nc -vz example.com 9200

Any OS — nmap

nmap -p 9200 example.com

Windows — PowerShell

Test-NetConnection example.com -Port 9200

open = a service answered on port 9200; closed = the host replied but nothing is listening; filtered = a firewall silently dropped the probe. These test from your network — our port checker tests from the outside, the view that matters for security.

Other common ports