A 3478 port refers to a type of Transmission Control Protocol (TCP) port specifically assigned for use by STUN (Session Traversal Utilities for NAT) protocol. It acts as a communication channel for establishing connections between devices traversing Network Address Translation (NAT) firewalls and routers in a network.
The 3478 port plays a crucial role in facilitating communication in various applications, particularly those involving real-time audio and video transmissions, such as Voice over IP (VoIP) and video conferencing. By allowing devices to communicate directly, it helps overcome the challenges posed by NAT, which can hinder direct connections between devices on different networks.