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Plesk/Tomcat SSL
Port 8443 is commonly used for secure web-based administrative interfaces such as the SW Soft Plesk Control Panel, Apache Tomcat Manager over SSL, and Promise WebPAM SSL management. Typically, it facilitates encrypted communications for web applications running outside the default HTTPS port (443), enabling secure management and service access without conflicting with standard HTTPS content..
Port 8443 is a popular alternative HTTPS port, used primarily when hosting SSL-enabled services that do not run on the default port 443. For example, many web management consoles like Plesk’s Control Panel employ 8443 to provide an isolated, secure interface for administrators, separate from the main website or application. It is also the default SSL port for Apache Tomcat Manager, a tool that allows administrators to manage Java application deployments securely.
The port supports encrypted HTTPS connections utilizing TLS/SSL protocols. The encryption ensures confidentiality and integrity during data transmission between the administration client and server. Since HTTPS traffic is inherently TCP-based, communication on this port benefits from established HTTP security features, such as certificate-based authentication and encrypted sessions.
Given its common use for management portals, this port often exposes web application frontends which may be customized or vendor-provided. As such, its behavior can vary widely, but it generally involves encrypted HTTP traffic intended for interactive user interfaces controlling server configurations, resource management, or application deployments.