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Port 8443: HTTPS Alternate (Plesk / Alt SSL)

Port 8443 is an alternate secure HTTPS port, widely used by Plesk Control Panel and enterprise SSL services.

Protocol
TCP
Category
Hosting & SSL
Common Services
Plesk Obsidian, Apache Tomcat SSL, UniFi Controller

What is Port 8443 and How Does It Work?

Port 8443 is an alternate secure HTTPS port, widely used by Plesk Control Panel and enterprise SSL services.

Security Vulnerabilities & Attack Vectors on Port 8443

Ensure strong TLS configurations and IP restriction for administrative interfaces listening on 8443.

Auditing & Scanning Port 8443 with Nmap

Run the following command to check if Port 8443 is reachable and determine service fingerprints:

nmap -p 8443 --script ssl-cert

Frequently Asked Questions

How do I check if Port 8443 is open?
Use cyber-tool.org diagnostic tools or run 'nc -zv 8443' in your terminal to verify open socket connections.
Is it safe to leave Port 8443 open to the internet?
Exposing Port 8443 (HTTPS Alternate (Plesk / Alt SSL)) publicly introduces potential exposure. Protect it with IP whitelisting, firewalls, and encryption.