Tools / Port checker / 9090
Is port 9090 open?
Port 9090 is Prometheus, Cockpit. Enter your server below to test it from Dallas, Amsterdam and London.
What port 9090 is used for
Default for the Prometheus monitoring server and the Cockpit Linux admin panel.
Should port 9090 be open?
Open it only to the addresses that need it. Prometheus has no authentication by default and reveals details of your infrastructure. Keep it private or behind auth.
How to open port 9090
Ubuntu or Debian with ufw, allowing only your own address (replace 203.0.113.10):
sudo ufw allow from 203.0.113.10 to any port 9090 proto tcp
Rocky, Alma or CentOS with firewalld:
sudo firewall-cmd --permanent --add-port=9090/tcp && sudo firewall-cmd --reload
Windows Server, in PowerShell as administrator:
New-NetFirewallRule -DisplayName "Port 9090" -Direction Inbound -Protocol TCP -LocalPort 9090 -Action Allow
Then check that the service listens on all addresses, not only 127.0.0.1, and test again above.
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Run your service on a PrivateByte server: a firewall you control and every port yours to open.