What does TCP port monitoring indicate?

TCP port monitoring primarily indicates the availability of a website, service, or application. By monitoring specific TCP ports, network administrators can determine whether a network service is up and running. Each service typically listens on a designated port (e.g., web servers on port 80 for HTTP or port 443 for HTTPS). If the port is accessible, it suggests that the corresponding service is functioning correctly, and users can connect to it.

In scenarios where port monitoring reveals that a particular port is not responding, it may signal that the service is down or that there are network issues preventing access. This proactive approach helps in quickly identifying and addressing service outages, ensuring that end users can access necessary applications and services without interruption.