What is required to obtain information about listen ports in NetTracer?

To obtain information about listen ports in NetTracer, an active TCP connection is necessary. This is because TCP (Transmission Control Protocol) is a connection-oriented protocol that establishes a reliable channel between two endpoints. The listen ports need to be verified through this established connection to correctly gather comprehensive data related to the application's listening behavior, state, and the services it offers.

Using TCP connections allows NetTracer to identify the exact state of the ports being monitored, ensuring detailed and accurate network performance insights. Other network activities, such as HTTP, UDP connections, or just any form of network activity, do not provide the same level of reliable data as a TCP connection would. TCP ensures that if data packets are lost during transmission, they can be resynchronized, which is essential for monitoring open ports and the services linked to them.