Port 8443 is used by Alternative HTTPS (HTTPS-Alt). Alternative HTTPS port. Used by some web applications, control panels (cPanel, Plesk), and services that run alongside a standard HTTPS server.
What Does an Open Port 8443 Mean?
An HTTPS service is running on an alternative port. Common for admin interfaces and control panels. Check what service is running if unexpected.
This port is expected to be open on servers that run this service.
Security Risk Level
Low Risk
How to Check if Port 8443 Is Open
Use the ExamineIP Port Scanner to check if port 8443 is open on any IP address from the public internet. Enter the target IP and select the relevant port preset.
How to Close Port 8443
- Stop the service using port 8443 if you no longer need it
- Add a firewall rule blocking inbound connections on port 8443
- Check your router for port forwarding rules that expose this port
- Run
netstat -ano | findstr :8443(Windows) to see which process is using it
Related Ports
HTTPS-Alt is related to: {implode(‘, ‘, Array)}
Protect Your Open Ports
If you need services like remote access, use a VPN to create a private encrypted tunnel instead of exposing ports directly to the internet. A VPN also hides your real IP address so port scanners cannot identify your device. Try PureVPN or IPVanish.