Tools / Port checker / 8443
Is port 8443 open?
Port 8443 is Alternative HTTPS. Enter your server below to test it from Dallas, Amsterdam and London.
What port 8443 is used for
HTTPS on a non-standard port, used by admin panels, Plesk, UniFi controllers and Kubernetes dashboards.
Should port 8443 be open?
Open it only to the addresses that need it. Usually an administrative interface: restrict access and keep the software updated.
How to open port 8443
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 8443 proto tcp
Rocky, Alma or CentOS with firewalld:
sudo firewall-cmd --permanent --add-port=8443/tcp && sudo firewall-cmd --reload
Windows Server, in PowerShell as administrator:
New-NetFirewallRule -DisplayName "Port 8443" -Direction Inbound -Protocol TCP -LocalPort 8443 -Action Allow
Then check that the service listens on all addresses, not only 127.0.0.1, and test again above.
Check another port
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Run your service on a PrivateByte server: a firewall you control and every port yours to open.