Port 9000 (TCP) — PHP-FPM / SonarQube / MinIO

PHP-FPM FastCGI default, also SonarQube and MinIO.

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An exposed PHP-FPM port allows remote code execution. Use a unix socket or bind to 127.0.0.1.

Check if port 9000 is open

On the server, see what is listening:

sudo ss -tulpn | grep ':9000 '

From another machine, test reachability:

nc -zv your-server.example.com 9000

With UFW (Ubuntu/Debian):

sudo ufw deny 9000

With firewalld (RHEL/AlmaLinux/Rocky):

sudo firewall-cmd --permanent --remove-port=9000/tcp && sudo firewall-cmd --reload