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Direct Connect C2C
Port 412 is primarily used for Direct Connect client-to-client (C2C) communications, facilitating peer-to-peer file sharing and messaging across users connected through Direct Connect hubs. It enables users to establish direct data transfers without routing traffic through centralized servers. This port plays a foundational role in the architecture of the Direct Connect protocol, known for enabling decentralized sharing of files and information..
Port 412 is commonly associated with Direct Connect, an early peer-to-peer (P2P) file-sharing protocol that allows users to connect to central hubs and then establish direct connections for data transfer. The client-to-client functionality of Direct Connect relies heavily on this port to negotiate and maintain direct peer connections, bypassing centralized traffic relaying to optimize resource usage and reduce hub load.
When clients communicate via port 412, they perform handshakes that facilitate the transfer of requested files or engage in chat functions. This communication typically occurs over TCP, as reliable data streaming is important for file integrity and session management. The port supports exchanging lists, managing search requests, and handling file part transfers.
While fundamental to Direct Connect operation, usage of port 412 is largely legacy, with some newer clients or protocols transitioning to encrypted or enhanced variants. Since it is unofficial and unregistered, implementations may vary, and service discovery typically relies on application-level negotiation rather than port-based protocol designations.